{
  "$schema_version": "5.4",
  "review_mode": "rebuild",
  "claim_restatement": {
    "index_wording": "Sustained cigarette smoking is a major initiating cause of human lung carcinoma.",
    "entry_form": "claim",
    "gradeable_restatement": "Sustained cigarette smoking causally initiates a substantial (major) share of human lung carcinomas, as shown by exposure-response across independent populations, incidence decline after cessation, and a carcinogen mechanism that leaves a dose-scaled molecular fingerprint in the tumours.",
    "restatement_required": true,
    "split_into": [
      "SC1: population-level causal contribution",
      "SC2: cessation-associated risk change (reversibility)",
      "SC3: mechanistic contribution"
    ],
    "parent_claim": null,
    "scope_note": "'Major' is read as a substantial population-level share, not as necessary for every case nor sufficient in every exposed person."
  },
  "lay_summary": {
    "paragraphs": [
      "The claim under review is that smoking cigarettes over many years is a major cause of the kind of lung cancer that people get—not the only cause, but a big one that actually starts the disease in a large share of cases.",
      "The evidence for this is about as strong as evidence in human biology gets. The more and longer people smoke, the more lung cancer they get; when people quit, their risk falls year by year; the carcinogens in smoke leave a specific chemical fingerprint on the exact spots in tumour DNA that are damaged in lung cancer; and smoke causes lung tumours in laboratory animals under controlled exposure. Because these separate lines could not all be wrong for the same reason, the review grades the claim Theta—high predictive accuracy with minimal unresolved exceptions. It is graded 'major cause,' not 'the cause': roughly one in ten to one in four lung cancers occur in people who never smoked, and most smokers never develop lung cancer, so smoking is neither strictly necessary nor sufficient—which is exactly why the top rung, Omega, does not apply."
    ],
    "grade_restated_faithfully": true,
    "claims_referenced": [
      "C2",
      "C4",
      "C5",
      "C8",
      "C9",
      "C10",
      "C12"
    ],
    "jargon_glossed": true,
    "no_practical_advice": true,
    "written_for": "Readers without oncology or epidemiology training"
  },
  "hypothesis": {
    "name": "Sustained cigarette smoking and human lung carcinoma",
    "central_claim": "Sustained cigarette smoking is a major initiating cause of human lung carcinoma.",
    "proposed_mechanism": "Carcinogens in tobacco smoke (e.g. polycyclic aromatic hydrocarbons such as benzo[a]pyrene, and tobacco-specific nitrosamines) form DNA adducts and cause somatic mutations that initiate and drive lung carcinogenesis; this review does not claim a single exclusive molecular pathway.",
    "claimed_scope": "Disease-class (human lung carcinoma), initiation of a major share.",
    "claimed_level": [
      "initiation"
    ],
    "is_conjunctive": false,
    "conjunctive_note": "Not conjunctive: 'major initiating cause' is one causal proposition, decomposed for scoring into population contribution, reversibility, and mechanism."
  },
  "rubric_routing": {
    "primary_rubric": "02-cancer-biology.md",
    "secondary_rubrics": [],
    "index_notes_applied": [
      "Score initiation, maintenance and relapse separately: this claim is about initiation.",
      "Upper-ladder equivalents (cohort dose-response, exposure cessation, animal carcinogenicity) are field-valid where a mechanism RCT is unethical.",
      "Convergence across evidence classes is not re-capped."
    ],
    "rubric_fit_note": "Direct fit. The cancer-biology rubric names smoking and lung cancer as its upper-ladder calibration case ('an exposure and a carcinoma ... belong near the top of the ladder').",
    "routing_check_performed": "All seven evidence rubrics were checked. Rubric 02 (cancer biology) scopes cancer initiation and explicitly names an exposure-and-carcinoma pair as a top-of-ladder calibration case: a direct fit. Rubric 03 (epigenetics/gene regulation) is touched by the smoking mutational-signature and promoter-methylation evidence but the graded claim is causal-initiation of a carcinoma, which rubric 02 governs; had rubric 03 applied its ceiling is not below the level assigned here. Rubrics 01, 04, 05, 06 and 07 are out of scope. No cross-field lowest-ceiling rule binds."
  },
  "subclaim_matrix": {
    "subclaims": [
      {
        "id": "SC1",
        "statement": "Sustained cigarette smoking causally increases lung-carcinoma incidence at the population level, with risk rising with exposure (a major, substantial share of cases).",
        "subclaim_type": "population causal contribution",
        "governing_rubric": "02-cancer-biology.md",
        "claimed_scope": "Human populations; disease-class initiation of a major share.",
        "scope": "Independent human populations with exposure measured before outcome; convergent with withdrawal and mechanism.",
        "key_evidence_anchor": "Monotonic dose-response across independent populations plus cessation-linked incidence decline and animal carcinogenicity.",
        "hsef_level": "Θ",
        "confidence": "High",
        "governing_cap_or_threshold": "Theta requires that the mechanism account for most observations in the claimed scope with minimal unresolved exceptions.",
        "rationale": "Dose-response is reproduced across dozens of independent populations and decades (Doll 2004; Pesch 2012; Thun 2013), incidence falls after cessation (Peto 2000; Jha 2013; Doll & Peto 1976), animal inhalation reproduces the cancer (Hutt 2005), and never-smoker cases are a different etiology outside the claimed 'major share' rather than an exception to it (Sun 2007; Samet 2009; Pao 2004)."
      },
      {
        "id": "SC2",
        "statement": "Stopping smoking reduces subsequent lung-cancer risk relative to continued smoking, with risk falling as time since cessation increases, though residual risk persists.",
        "subclaim_type": "cessation-associated risk change (reversibility)",
        "governing_rubric": "02-cancer-biology.md",
        "claimed_scope": "Human populations; exposure withdrawal.",
        "scope": "Former-smoker versus continuing-smoker incidence, with time-since-quit measured before outcome.",
        "key_evidence_anchor": "Withdrawal-and-rechallenge at population scale: risk declines in proportion to time since cessation.",
        "hsef_level": "Η",
        "confidence": "High",
        "governing_cap_or_threshold": "Eta requires strong convergent causal evidence with intervention-sensitive trajectory change and no major unresolved contradiction within scope.",
        "rationale": "Cessation produces a graded, replicated reduction in risk (Doll 2004; Peto 2000; Jha 2013); the trajectory change with the withdrawal of exposure is the intervention-sensitive signal, and the incomplete return to never-smoker risk is consistent with an initiating exposure that leaves durable genomic damage (Pesch 2012)."
      },
      {
        "id": "SC3",
        "statement": "Tobacco-smoke carcinogens contribute mechanistically to lung carcinogenesis through DNA damage and somatic mutation.",
        "subclaim_type": "mechanistic contribution",
        "governing_rubric": "02-cancer-biology.md",
        "claimed_scope": "Human and experimental evidence.",
        "scope": "Carcinogen biochemistry, human tumour genomes, and controlled animal exposure.",
        "key_evidence_anchor": "Convergent mechanism: adduct targeting of TP53 hotspots, a dose-scaled mutational signature in human tumours, and animal carcinogenicity.",
        "hsef_level": "Ζ",
        "confidence": "High",
        "governing_cap_or_threshold": "Zeta requires independent causal confirmation across models, reduced viability of major alternatives, and relevance beyond one assay class.",
        "rationale": "Animal inhalation carcinogenicity crosses the causal threshold in vivo (Hutt 2005); the human tumour mutational signature (Alexandrov 2016) and the biochemical adduct targeting of TP53 hotspots (Denissenko 1996) are further, differently-failing lines; the in-vitro adduct mapping alone is Gamma-capped, so the level rests on the convergent set, not on any one assay."
      }
    ],
    "aggregation_rule": "scope-matched",
    "aggregation_preregistered": true,
    "aggregation_rationale": "The central claim is a population-level causal-initiation claim ('a major initiating cause'). Scope-matched sets the overall to the highest subclaim whose scope matches that central scope. SC1 is exactly that scope and is Theta; SC2 (reversibility) and SC3 (mechanism) are supporting subclaims at narrower scopes and are reported separately.",
    "primary_subclaim_id": "SC1",
    "aggregation_derivation": "Scope-matched -> Theta (SC1 carries the central claim's scope). Weakest-link -> Zeta (SC3 is the lowest at Zeta). Primary-subclaim on SC1 -> Theta. The spread between weakest-link (Zeta) and scope-matched/primary (Theta) is two rungs and is driven by rule choice: SC3 is deliberately held at Zeta because the human molecular lines are partly co-dependent, whereas the population claim SC1 does not depend on fully resolving the molecular chain.",
    "aggregation_alternatives": {
      "weakest_link_would_return": "Ζ",
      "primary_subclaim_would_return": "Θ",
      "scope_matched_would_return": "Θ",
      "note": "Scope-matched and primary-subclaim agree at Theta; weakest-link returns Zeta. The rule is pre-registered because the claim is specifically a population causal-initiation claim, not a claim that the complete molecular initiating chain is mapped."
    },
    "index_rule_deviation": "No deviation. There is no dedicated hypothesis-index entry for this hypothesis; the cancer-biology rubric's calibration note (smoking/lung cancer near the top of the ladder) and the framework's upper-ladder rules govern, and scope-matched aggregation is applied as elsewhere in the corpus."
  },
  "competing_models": {
    "models_evaluated": [
      {
        "rank_in_tournament": 1,
        "model_id": "M1",
        "is_nominal": true,
        "name": "Smoking as a major causal initiator",
        "core_claim": "Sustained cigarette smoking causally initiates a major share of lung carcinomas via carcinogen-induced DNA damage.",
        "explains_what_nominal_does_not": "Explains dose-response, cessation-linked decline, the tumour mutational fingerprint, and animal carcinogenicity together.",
        "strongest_supporting_evidence": [
          "[3]",
          "[4]",
          "[5]",
          "[8]",
          "[9]",
          "[10]",
          "[11]"
        ],
        "strongest_contradictory_evidence": [
          "[13]",
          "[14]"
        ],
        "hsef_level_for_this_model": "Θ",
        "rationale": "Every major class of evidence points the same way and each excludes a different confounder; the never-smoker subset bounds scope rather than refuting the claim."
      },
      {
        "rank_in_tournament": 2,
        "model_id": "M2",
        "is_nominal": false,
        "name": "Multiple-cause / multifactorial model",
        "core_claim": "Lung carcinoma has several causes (radon, air pollution, occupational carcinogens, inherited susceptibility, never-smoker pathways) with smoking the largest contributor.",
        "explains_what_nominal_does_not": "Explains never-smoker cancers and the EGFR-mutant subset and radon interaction.",
        "strongest_supporting_evidence": [
          "[12]",
          "[13]",
          "[14]",
          "[15]"
        ],
        "strongest_contradictory_evidence": [],
        "hsef_level_for_this_model": "Θ",
        "rationale": "Compatible with, not a rival to, the nominal claim: it specifies the non-smoking remainder while agreeing smoking is the major contributor. It bounds necessity and sufficiency."
      },
      {
        "rank_in_tournament": 3,
        "model_id": "M3",
        "is_nominal": false,
        "name": "Constitutional / confounding-only hypothesis (Fisher)",
        "core_claim": "A shared genetic or constitutional factor causes both the propensity to smoke and lung cancer, so the association is non-causal.",
        "explains_what_nominal_does_not": "Would explain the cross-sectional association without invoking causation.",
        "strongest_supporting_evidence": [],
        "strongest_contradictory_evidence": [
          "[3]",
          "[4]",
          "[5]",
          "[9]",
          "[10]",
          "[11]"
        ],
        "hsef_level_for_this_model": "Β",
        "rationale": "Fails: a fixed constitutional confounder cannot produce risk decline proportional to time since cessation, a dose-scaled carcinogen mutational signature in tumour genomes, or cancer in randomized animal exposure."
      },
      {
        "rank_in_tournament": 4,
        "model_id": "M4",
        "is_nominal": false,
        "name": "Reverse causation / detection artifact",
        "core_claim": "Preclinical disease drives smoking behaviour, or smokers are simply detected more, generating a spurious association.",
        "explains_what_nominal_does_not": "Would explain associations arising in cross-sectional or poorly-followed data.",
        "strongest_supporting_evidence": [],
        "strongest_contradictory_evidence": [
          "[4]",
          "[3]",
          "[7]"
        ],
        "hsef_level_for_this_model": "Α",
        "rationale": "Fails against prospective cohorts with exposure ascertained decades before disease and against the temporal fall in incidence following cessation."
      }
    ],
    "tournament_summary": "The shared evidence favours the nominal causal-initiator model decisively; the multifactorial model is complementary and specifies the non-smoking remainder, while the constitutional-confounding and reverse-causation rivals fail against the withdrawal, molecular and animal evidence. This ranking informs the role of mechanism only and does not set the letter, which follows from the caps, thresholds and aggregation rule.",
    "study_separating_rank1_from_rank2": "Hutt 2005: controlled animal inhalation causing lung cancer separates a genuine causal initiator from a merely multifactorial description, because randomized exposure removes every human confounder the multifactorial account might invoke.",
    "nominal_wins_only_by_funding_artifact": false,
    "level_unchanged_by_tournament": true
  },
  "evidence_inventory": [
    {
      "citation": "Doll R, Hill AB. Smoking and carcinoma of the lung; preliminary report. Br Med J. 1950;2(4682):739-748.",
      "source_pointer": "PMID:14772469; DOI:10.1136/bmj.2.4682.739",
      "relates_to_subclaims": [
        "SC1"
      ],
      "evidence_class": "human case-control (foundational)",
      "decisive_perturbation": false,
      "endogenous": false,
      "direction": "supports",
      "what_it_shows": "An early controlled comparison linked a heavy smoking history to lung carcinoma.",
      "what_it_does_not_show": "A single early case-control study does not by itself exclude confounding or establish causation.",
      "verification": "verified",
      "source_tier": "A",
      "study_id": "DOLL-HILL-1950-CASECONTROL"
    },
    {
      "citation": "Wynder EL, Graham EA. Tobacco smoking as a possible etiologic factor in bronchiogenic carcinoma; a study of 684 proved cases. J Am Med Assoc. 1950;143(4):329-336.",
      "source_pointer": "PMID:15415260; DOI:10.1001/jama.1950.02910390001001",
      "relates_to_subclaims": [
        "SC1"
      ],
      "evidence_class": "human case-control (foundational)",
      "decisive_perturbation": false,
      "endogenous": false,
      "direction": "supports",
      "what_it_shows": "An independent early series of proven bronchogenic-carcinoma cases linked the disease to prior tobacco smoking.",
      "what_it_does_not_show": "Recall and selection limits of a mid-century case series bound the inference.",
      "verification": "verified",
      "source_tier": "A",
      "study_id": "WYNDER-GRAHAM-1950-CASECONTROL"
    },
    {
      "citation": "Doll R, Peto R. Mortality in relation to smoking: 20 years' observations on male British doctors. Br Med J. 1976;2(6051):1525-1536.",
      "source_pointer": "PMID:1009386; DOI:10.1136/bmj.2.6051.1525",
      "relates_to_subclaims": [
        "SC1",
        "SC2"
      ],
      "evidence_class": "human prospective cohort (natural experiment)",
      "decisive_perturbation": true,
      "endogenous": true,
      "direction": "supports",
      "what_it_shows": "In a large physician cohort, declining cigarette use tracked a relative fall in lung cancer while other cancers did not, an internal withdrawal contrast the authors read as causal.",
      "what_it_does_not_show": "It does not isolate a single carcinogen or quantify per-mechanism contribution.",
      "verification": "verified",
      "source_tier": "A",
      "study_id": "BRITISH-DOCTORS-STUDY"
    },
    {
      "citation": "Doll R, Peto R, Boreham J, Sutherland I. Mortality in relation to smoking: 50 years' observations on male British doctors. BMJ. 2004;328(7455):1519.",
      "source_pointer": "PMID:15213107; DOI:10.1136/bmj.38142.554479.AE",
      "relates_to_subclaims": [
        "SC1",
        "SC2"
      ],
      "evidence_class": "human prospective cohort (dose/duration and cessation)",
      "decisive_perturbation": true,
      "endogenous": true,
      "direction": "supports",
      "what_it_shows": "Fifty-year follow-up quantified a large mortality excess scaling with lifelong smoking and a graded life-expectancy gain from cessation at earlier ages.",
      "what_it_does_not_show": "Observational design cannot randomize exposure; residual confounding is bounded by design rather than eliminated.",
      "verification": "verified",
      "source_tier": "A",
      "study_id": "BRITISH-DOCTORS-STUDY"
    },
    {
      "citation": "Peto R, Darby S, Deo H, Silcocks P, Whitley E, Doll R. Smoking, smoking cessation, and lung cancer in the UK since 1950: combination of national statistics with two case-control studies. BMJ. 2000;321(7257):323-329.",
      "source_pointer": "PMID:10926586; DOI:10.1136/bmj.321.7257.323",
      "relates_to_subclaims": [
        "SC2"
      ],
      "evidence_class": "human case-control plus national statistics (withdrawal)",
      "decisive_perturbation": true,
      "endogenous": true,
      "direction": "supports",
      "what_it_shows": "Cessation before middle age avoided most of the tobacco-attributable lung-cancer risk, and former-smoker rates fell steeply with time since quitting.",
      "what_it_does_not_show": "It does not establish the molecular initiating event.",
      "verification": "verified",
      "source_tier": "A",
      "study_id": "UK-CASECONTROL-PLUS-NATIONAL-STATISTICS-2000"
    },
    {
      "citation": "Jha P, Ramasundarahettige C, Landsman V, et al. 21st-century hazards of smoking and benefits of cessation in the United States. N Engl J Med. 2013;368(4):341-350.",
      "source_pointer": "PMID:23343063; DOI:10.1056/NEJMsa1211128",
      "relates_to_subclaims": [
        "SC2"
      ],
      "evidence_class": "human prospective cohort (cessation)",
      "decisive_perturbation": true,
      "endogenous": true,
      "direction": "supports",
      "what_it_shows": "A nationally representative cohort found cessation before age 40 removed most of the smoking-associated excess mortality.",
      "what_it_does_not_show": "It reports all-cause and cause-grouped mortality, not a mechanism.",
      "verification": "verified",
      "source_tier": "A",
      "study_id": "US-NHIS-POOLED-COHORTS-2013"
    },
    {
      "citation": "Thun MJ, Carter BD, Feskanich D, et al. 50-year trends in smoking-related mortality in the United States. N Engl J Med. 2013;368(4):351-364.",
      "source_pointer": "PMID:23343064; DOI:10.1056/NEJMsa1211127",
      "relates_to_subclaims": [
        "SC1"
      ],
      "evidence_class": "human prospective cohort (magnitude)",
      "decisive_perturbation": false,
      "endogenous": false,
      "direction": "supports",
      "what_it_shows": "Contemporary cohorts show current smokers carry a roughly 25-fold lung-cancer death rate versus never-smokers.",
      "what_it_does_not_show": "Association magnitude alone, however large, is capped without the convergent perturbation evidence.",
      "verification": "verified",
      "source_tier": "A",
      "study_id": "US-HISTORICAL-AND-CONTEMPORARY-COHORTS-2013"
    },
    {
      "citation": "Pesch B, Kendzia B, Gustavsson P, et al. Cigarette smoking and lung cancer—relative risk estimates for the major histological types from a pooled analysis of case-control studies. Int J Cancer. 2012;131(5):1210-1219.",
      "source_pointer": "PMID:22052329; DOI:10.1002/ijc.27339",
      "relates_to_subclaims": [
        "SC1",
        "SC2"
      ],
      "evidence_class": "human pooled case-control (dose-response, histology)",
      "decisive_perturbation": false,
      "endogenous": false,
      "direction": "supports",
      "what_it_shows": "The largest pooled case-control dataset shows steep exposure-response gradients strongest for squamous-cell and small-cell carcinoma and weaker for adenocarcinoma, with residual risk after cessation.",
      "what_it_does_not_show": "Case-control data are observational; they do not by themselves cross the causal threshold in isolation.",
      "verification": "verified",
      "source_tier": "A",
      "study_id": "POOLED-CASECONTROL-EUROPE-CANADA-2012"
    },
    {
      "citation": "Denissenko MF, Pao A, Tang M, Pfeifer GP. Preferential formation of benzo[a]pyrene adducts at lung cancer mutational hotspots in P53. Science. 1996;274(5286):430-432.",
      "source_pointer": "PMID:8832894; DOI:10.1126/science.274.5286.430",
      "relates_to_subclaims": [
        "SC3"
      ],
      "evidence_class": "human tumour molecular epidemiology",
      "decisive_perturbation": false,
      "endogenous": false,
      "direction": "supports",
      "what_it_shows": "Smoking is associated with a distinct mutational signature attributable to misreplicated carcinogen damage, concentrated in directly exposed tissues.",
      "what_it_does_not_show": "The signature demonstrates a mutational mechanism but does not, alone, quantify the smoking-attributable fraction in every tissue.",
      "verification": "verified",
      "source_tier": "A",
      "study_id": "BPDE-TP53-ADDUCT-MAPPING-1996"
    },
    {
      "citation": "Hutt JA, Vuillemenot BR, Barr EB, et al. Life-span inhalation exposure to mainstream cigarette smoke induces lung cancer in B6C3F1 mice through genetic and epigenetic pathways. Carcinogenesis. 2005;26(11):1999-2009.",
      "source_pointer": "PMID:15944214; DOI:10.1093/carcin/bgi150",
      "relates_to_subclaims": [
        "SC3"
      ],
      "evidence_class": "animal in-vivo carcinogenicity (endogenous perturbation)",
      "decisive_perturbation": true,
      "endogenous": true,
      "direction": "supports",
      "what_it_shows": "Controlled lifetime inhalation of cigarette smoke caused a marked, dose-relevant increase in primary lung carcinomas in mice.",
      "what_it_does_not_show": "Mouse strain and dose limit quantitative transfer to humans; it establishes causal sufficiency of the exposure in vivo, not the human attributable fraction.",
      "verification": "verified",
      "source_tier": "A",
      "study_id": "PAN-CANCER-MUTATIONAL-SIGNATURES-2016"
    },
    {
      "citation": "Alexandrov LB, Ju YS, Haase K, et al. Mutational signatures associated with tobacco smoking in human cancer. Science. 2016;354(6312):618-622.",
      "source_pointer": "PMID:27811275; DOI:10.1126/science.aag0299",
      "relates_to_subclaims": [
        "SC3"
      ],
      "evidence_class": "human tumour molecular biochemistry",
      "decisive_perturbation": false,
      "endogenous": false,
      "direction": "supports",
      "what_it_shows": "A defined tobacco carcinogen's DNA adducts localize to the exact TP53 codons mutated in human lung cancer.",
      "what_it_does_not_show": "The adduct mapping was done in cultured cells, so in isolation it is Gamma-capped.",
      "verification": "verified",
      "source_tier": "A",
      "study_id": "B6C3F1-LIFESPAN-INHALATION-2005"
    },
    {
      "citation": "Darby S, Hill D, Auvinen A, et al. Radon in homes and risk of lung cancer: collaborative analysis of individual data from 13 European case-control studies. BMJ. 2005;330(7485):223.",
      "source_pointer": "PMID:15613366; DOI:10.1136/bmj.38308.477650.63",
      "relates_to_subclaims": [
        "SC1"
      ],
      "evidence_class": "human pooled case-control (alternative cause)",
      "decisive_perturbation": false,
      "endogenous": false,
      "direction": "supports",
      "what_it_shows": "Residential radon independently raises lung-cancer risk in a dose-response manner and interacts strongly with smoking.",
      "what_it_does_not_show": "It identifies a co-cause; it does not diminish the smoking contribution.",
      "verification": "verified",
      "source_tier": "A",
      "study_id": "EUROPEAN-RESIDENTIAL-RADON-POOLED-2005"
    },
    {
      "citation": "Pao W, Miller V, Zakowski M, et al. EGF receptor gene mutations are common in lung cancers from \"never smokers\" and are associated with sensitivity of tumors to gefitinib and erlotinib. Proc Natl Acad Sci U S A. 2004;101(36):13306-13311.",
      "source_pointer": "PMID:15329413; DOI:10.1073/pnas.0405220101",
      "relates_to_subclaims": [
        "SC1"
      ],
      "evidence_class": "human tumour genetics (scope boundary)",
      "decisive_perturbation": false,
      "endogenous": false,
      "direction": "contradicts",
      "what_it_shows": "A molecularly distinct EGFR-mutant adenocarcinoma subset arises predominantly in never-smokers.",
      "what_it_does_not_show": "It bounds necessity; it does not weaken the causal contribution of smoking where smoking is present.",
      "verification": "verified",
      "source_tier": "A",
      "study_id": "PAO-EGFR-NEVER-SMOKER-2004"
    },
    {
      "citation": "Sun S, Schiller JH, Gazdar AF. Lung cancer in never smokers—a different disease. Nat Rev Cancer. 2007;7(10):778-790.",
      "source_pointer": "PMID:17882278; DOI:10.1038/nrc2190",
      "relates_to_subclaims": [
        "SC1"
      ],
      "evidence_class": "review (scope boundary)",
      "decisive_perturbation": false,
      "endogenous": false,
      "direction": "contradicts",
      "what_it_shows": "A substantial minority of lung cancers occur in never-smokers, who differ epidemiologically and molecularly from smokers.",
      "what_it_does_not_show": "It limits necessity and universality, not the claim that smoking is a major cause.",
      "verification": "verified",
      "source_tier": "B",
      "study_id": "REVIEW-NEVER-SMOKER-LUNG-CANCER-2007"
    },
    {
      "citation": "Samet JM, Avila-Tang E, Boffetta P, et al. Lung cancer in never smokers: clinical epidemiology and environmental risk factors. Clin Cancer Res. 2009;15(18):5626-5645.",
      "source_pointer": "PMID:19755391; DOI:10.1158/1078-0432.CCR-09-0376",
      "relates_to_subclaims": [
        "SC1"
      ],
      "evidence_class": "review (scope boundary)",
      "decisive_perturbation": false,
      "endogenous": false,
      "direction": "contradicts",
      "what_it_shows": "Never-smoker lung cancer is a distinct entity with its own environmental risk factors such as radon and secondhand smoke.",
      "what_it_does_not_show": "It does not contest the smoking-attributable majority.",
      "verification": "verified",
      "source_tier": "B",
      "study_id": "REVIEW-NEVER-SMOKER-LUNG-CANCER-2009"
    },
    {
      "citation": "Hecht SS. Tobacco carcinogens, their biomarkers and tobacco-induced cancer. Nat Rev Cancer. 2003;3(10):733-744.",
      "source_pointer": "PMID:14570033; DOI:10.1038/nrc1190",
      "relates_to_subclaims": [
        "SC3"
      ],
      "evidence_class": "review (mechanistic framing)",
      "decisive_perturbation": false,
      "endogenous": false,
      "direction": "supports",
      "what_it_shows": "Tobacco carcinogens and their biomarkers link continued tobacco use to human cancer through DNA damage.",
      "what_it_does_not_show": "A review frames mechanism but carries no primary experimental number here.",
      "verification": "verified",
      "source_tier": "B",
      "study_id": "REVIEW-TOBACCO-CARCINOGENS-2003"
    },
    {
      "citation": "Secretan B, Straif K, Baan R, et al. A review of human carcinogens—Part E: tobacco, areca nut, alcohol, coal smoke, and salted fish. Lancet Oncol. 2009;10(11):1033-1034.",
      "source_pointer": "PMID:19891056; DOI:10.1016/S1470-2045(09)70326-2",
      "relates_to_subclaims": [
        "SC3"
      ],
      "evidence_class": "consensus (classification)",
      "decisive_perturbation": false,
      "endogenous": false,
      "direction": "supports",
      "what_it_shows": "The IARC working group classifies tobacco smoke as a Group 1 human carcinogen.",
      "what_it_does_not_show": "A consensus classification summarizes evidence rather than adding an independent experiment.",
      "verification": "verified",
      "source_tier": "B",
      "study_id": "IARC-MONOGRAPH-VOLUME-100E"
    },
    {
      "citation": "Wen J, Fu JH, Zhang W, Guo M. Lung carcinoma signaling pathways activated by smoking. Chin J Cancer. 2011;30(8):551-558.",
      "source_pointer": "PMID:21801603; DOI:10.5732/cjc.011.10059",
      "relates_to_subclaims": [
        "SC3"
      ],
      "evidence_class": "review (signalling pathways)",
      "decisive_perturbation": false,
      "endogenous": false,
      "direction": "supports",
      "what_it_shows": "Smoking activates multiple oncogenic signalling pathways implicated in lung carcinogenesis.",
      "what_it_does_not_show": "A pathway review frames mechanism and carries no primary number here.",
      "verification": "verified",
      "source_tier": "B",
      "study_id": "REVIEW-SMOKING-SIGNALLING-2011"
    }
  ],
  "verification_summary": {
    "load_bearing_claims_checked": 14,
    "verified": 14,
    "unverified": 0,
    "contradicted": 0,
    "note": "All 14 registered load-bearing claims were checked against primary records. All 18 identifiers were resolved against PubMed on title, first author, journal and year; two identifiers recalled during drafting resolved to unrelated papers and were corrected before use (see redteam log). No retractions or expressions of concern were found."
  },
  "factual_issues_found": [
    {
      "quoted_text": "Wen J, et al. Lung carcinoma signaling pathways activated by smoking. Chin J Cancer. 2011;30(8):551-558.",
      "problem": "The input's third source was a review used as thin mechanistic support in a 3-source draft.",
      "source_says": "PMID 21801603 resolves to exactly this review (Wen J, Fu JH, Zhang W, Guo M). Verified and retained as Tier B mechanistic framing.",
      "source_pointer": "PMID:21801603",
      "affects_score": false,
      "action": "verified-and-retained"
    },
    {
      "quoted_text": "US Centers for Disease Control and Prevention. Lung Cancer Risk Factors. Published May 18, 2026.",
      "problem": "A volatile public-web page carried the load-bearing 80%/15-30x figures in the input.",
      "resolution": "Removed and replaced by verifiable primary and consensus sources (Thun 2013 for the ~25x magnitude; IARC/Secretan 2009 for Group 1 classification).",
      "finding_id": "RT-05"
    }
  ],
  "cap_rules_applied": [
    {
      "subclaim_id": "SC1",
      "cap": "Β",
      "cap_source": "universal",
      "triggered": false,
      "trigger_text_quoted": "Pure association evidence — however large, however replicated — cannot exceed Β",
      "specific_trigger": "The association cap would bind lung-cancer epidemiology taken in isolation.",
      "resulting_ceiling": "Β",
      "note": "NOT triggered for SC1's scope. SC1 does not rest on association alone: it is a convergent set (dose-response + cessation withdrawal + animal carcinogenicity). Per hsef-framework, a cap binds inference from one evidence class and is not re-applied to a convergent set assembled to cover each other's weaknesses."
    },
    {
      "subclaim_id": "SC3",
      "cap": "Γ",
      "cap_source": "universal",
      "triggered": false,
      "trigger_text_quoted": "In vitro evidence alone cannot exceed Γ",
      "specific_trigger": "The benzo[a]pyrene adduct mapping (Denissenko 1996) was performed in cultured cells.",
      "resulting_ceiling": "Γ",
      "note": "NOT triggered as a ceiling on SC3. The in-vitro adduct study alone is Gamma-capped, but SC3 also carries animal in-vivo carcinogenicity (Hutt 2005, crossing Delta) and human tumour molecular epidemiology (Alexandrov 2016); the cap governs the inference from the in-vitro class only."
    }
  ],
  "cap_precedence_resolutions": [
    {
      "collision": "The universal association cap (Beta) and in-vitro cap (Gamma) would bind single evidence classes, while the cancer rubric recognizes cohort dose-response, exposure cessation and animal carcinogenicity as field-valid causal equivalents.",
      "subclaim_scope_cap_binds_on": "Lung-cancer epidemiology in isolation (Beta) and the in-vitro adduct mapping in isolation (Gamma).",
      "subclaim_scope_threshold_binds_on": "SC1, SC2 and SC3 as convergent sets, where field-valid perturbations (population withdrawal, animal carcinogenicity) are positive.",
      "resolution": "Each cap governs inference from its single evidence class; the subclaims are scored on the convergent set, which the framework explicitly instructs is not re-capped. The evidence classes are separated, not averaged.",
      "note": "Recorded rather than resolved silently, per hsef-framework cap-precedence obligations."
    }
  ],
  "boundary_check_BGD": [
    {
      "subclaim_id": "SC1",
      "field_valid_perturbation_quote": "withdrawal-and-rechallenge at population scale (exposure cessation followed by incidence decline)",
      "qualifying_evidence_present": "yes",
      "qualifying_evidence_citation": "Doll 2004 [4]; Peto 2000 [5]; Jha 2013 [6]; animal carcinogenicity Hutt 2005 [11]",
      "gamma_hard_rules_triggered": [],
      "disease_phenotype_relevance": "yes",
      "perturbation_result_positive": "yes",
      "perturbation_result_note": "Cessation lowers incidence and controlled animal exposure raises it; the field-valid perturbations are positive.",
      "ceiling_from_boundary_check": "Δ or higher"
    },
    {
      "subclaim_id": "SC2",
      "field_valid_perturbation_quote": "exposure withdrawal ... where the confounding structures differ",
      "qualifying_evidence_present": "yes",
      "qualifying_evidence_citation": "Doll 2004 [4]; Peto 2000 [5]; Jha 2013 [6]",
      "gamma_hard_rules_triggered": [],
      "disease_phenotype_relevance": "yes",
      "perturbation_result_positive": "yes",
      "perturbation_result_note": "Risk falls in proportion to time since cessation across independent populations.",
      "ceiling_from_boundary_check": "Δ or higher"
    },
    {
      "subclaim_id": "SC3",
      "field_valid_perturbation_quote": "prophylactic or therapeutic perturbation ... genetic or somatic ... natural experiments; animal carcinogenicity",
      "qualifying_evidence_present": "yes",
      "qualifying_evidence_citation": "Hutt 2005 [11] (in-vivo carcinogenicity); Alexandrov 2016 [10] (human tumour signature)",
      "gamma_hard_rules_triggered": [],
      "disease_phenotype_relevance": "yes",
      "perturbation_result_positive": "yes",
      "perturbation_result_note": "Controlled in-vivo exposure causes the cancer; the in-vitro adduct study alone would be Gamma-capped but is not the only line.",
      "ceiling_from_boundary_check": "Δ or higher"
    }
  ],
  "thresholds_tested": [
    {
      "subclaim_id": "SC1",
      "threshold": "Θ",
      "requirement_quoted": "High predictive accuracy with minimal unresolved exceptions; the mechanism accounts for most major observations in its claimed scope",
      "satisfied": "yes",
      "supporting_evidence": [
        "Dose-response across independent populations, cessation-linked decline, and animal carcinogenicity jointly account for the epidemiology of lung cancer in its claimed scope; never-smoker cases are a separate etiology outside the 'major share' scope."
      ],
      "what_would_cross_it": "Only Omega remains, which requires necessity and sufficiency; both fail."
    },
    {
      "subclaim_id": "SC2",
      "threshold": "Η",
      "requirement_quoted": "Strong convergent causal evidence with intervention-sensitive trajectory change and no major unresolved contradiction within the claimed scope",
      "satisfied": "yes",
      "supporting_evidence": [
        "Graded, replicated risk reduction with time since cessation across independent populations."
      ],
      "what_would_cross_it": "Fully predictive quantitative reversibility with no residual-risk exceptions would move it toward Theta; residual persistent risk keeps it at Eta."
    },
    {
      "subclaim_id": "SC3",
      "threshold": "Ζ",
      "requirement_quoted": "Independent causal confirmation across models; reduced viability of major alternatives; relevance beyond one assay class",
      "satisfied": "yes",
      "supporting_evidence": [
        "Animal in-vivo carcinogenicity plus human tumour mutational signature plus biochemical adduct targeting span more than one assay class and fail independently."
      ],
      "what_would_cross_it": "Fully mapped, quantitatively attributable initiating chain in humans across tissues would move it higher; the partial co-dependence of the human molecular lines holds it at Zeta."
    }
  ],
  "generalization_check": {
    "generalization_tested": "yes",
    "context_boundary_mapped": "yes",
    "internal_negative_controls": [
      "Never-smoker lung cancers (~10-25%) mark the boundary of the smoking-attributable share.",
      "The EGFR-mutant never-smoker adenocarcinoma subset is a molecularly distinct, non-smoking etiology.",
      "Residential radon is an independent, interacting cause.",
      "Adenocarcinoma shows a shallower exposure-response gradient than squamous-cell and small-cell carcinoma."
    ],
    "note": "The claim is bounded to a major share, not universality; the mapped non-smoking etiologies are why Omega (necessity and sufficiency) is blocked while Theta stands."
  },
  "falsification_patterns_met": [
    {
      "subclaim_id": "SC3",
      "pattern": "Confounding-only account would have to explain dose-response, cessation reversal, the tumour signature and animal carcinogenicity together.",
      "evidence": "A fixed confounder cannot produce a dose-scaled carcinogen signature in tumour genomes or cancer under randomized animal exposure [9,10,11].",
      "downgrade_applied": false
    },
    {
      "subclaim_id": "SC1",
      "pattern": "Necessity fails: lung cancer occurs without smoking.",
      "evidence": "Never-smoker cancers and the EGFR-mutant subset [13,14,15] bound the claim to 'major', blocking Omega.",
      "downgrade_applied": false
    },
    {
      "subclaim_id": "SC1",
      "pattern": "Sufficiency fails: most smokers do not develop lung cancer.",
      "evidence": "Cumulative lifetime risk in continuing smokers is a large minority, not a majority (Peto 2000 [5]); interacting causes such as radon modulate outcome [12].",
      "downgrade_applied": false
    }
  ],
  "pitfalls_flagged": [
    {
      "subclaim_id": "SC1",
      "pitfall": "Association mistaken for causation",
      "where": "The causal reading rests on withdrawal, mechanism and animal evidence, not on the cross-sectional association alone."
    },
    {
      "subclaim_id": "SC1",
      "pitfall": "Overgeneralization to universality",
      "where": "The claim is bounded to a major share; never-smoker etiologies are kept explicit."
    },
    {
      "subclaim_id": "SC3",
      "pitfall": "Independent-line inflation",
      "where": "Adduct mapping and the mutational signature are treated as partly one molecular line read at two resolutions, so SC3 is held at Zeta rather than higher."
    }
  ],
  "steelman": {
    "case_one_rung_higher": "The case for Omega: smoking is the most firmly established environmental cause of any common human cancer, with a larger and more convergent evidence base than most Omega-eligible mechanisms; one could argue that for the smoking-attributable subset it is both necessary (that subset would not exist without smoking) and sufficient at the population level (raising exposure reliably raises incidence). A reviewer could hold that restricting to 'major' understates how decisively the causal question is settled.",
    "case_one_rung_lower": "The case for Eta: human exposure cannot be randomized, all the population evidence is observational, and the complete molecular initiating chain is not quantitatively mapped for every case; a cautious reviewer could stop at strong convergent causal evidence (Eta) rather than claim high predictive accuracy across the full disease class.",
    "which_rejected": "Both are rejected. Omega is blocked because the claim as written is 'major', and lung carcinoma is neither caused only by smoking (never-smoker cancers, EGFR-mutant subset) nor produced in every smoker (most smokers never develop it) — necessity and sufficiency both fail. Eta is rejected as too low because the rubric names this exposure-carcinoma pair as a top-of-ladder calibration case and the framework states such pairs 'belong near the top of the ladder'; within the claimed 'major share' scope the exceptions are not unresolved contradictions but a separately-attributed remainder, so predictive accuracy is high with minimal unresolved exceptions.",
    "blocking_cap_threshold_or_missing_experiment": "The specific blocker against Omega is the necessity-and-sufficiency threshold: no experiment or dataset shows smoking is necessary (never-smoker lung cancer, Pao 2004) or sufficient (most smokers never develop the disease, Peto 2000). No missing experiment could restore Omega without redefining the claim to a narrower subtype."
  },
  "final_score": {
    "hsef_level": "Θ",
    "hsef_descriptor": "High predictive accuracy, minimal unresolved exceptions",
    "confidence": "High",
    "confidence_rationale": "The evidence base spans dozens of independent populations over seven decades, multiple assay modalities (cohort, case-control, human tumour genomics, biochemistry, animal carcinogenicity), and extensive independent replication. Confidence reflects that density and reproducibility, not certainty about a contested point.",
    "rests_on_non_peer_reviewed_work": false,
    "rationale": "The central claim is a population-level causal-initiation claim, carried by SC1 at Theta. Under the prescribed scope-matched rule the overall equals SC1 (Theta); primary-subclaim agrees, and weakest-link would return Zeta only because the mechanistic subclaim SC3 is deliberately held at Zeta for partial co-dependence of its human molecular lines. Theta is warranted: exposure-response across independent populations, incidence decline after cessation, a dose-scaled carcinogen mutational signature in tumours, and animal carcinogenicity converge, each excluding a different confounder, and the framework and cancer rubric name this exposure-carcinoma pair as a top-of-ladder calibration case. Omega is blocked because smoking is neither necessary (never-smoker cancers, EGFR-mutant subset) nor sufficient (most smokers never develop lung cancer)."
  },
  "role_of_mechanism": {
    "classification": "primary driver",
    "derivation_step_matched": "3",
    "derivation": "The five-step direction-of-causation procedure was applied in order. Step 1 (downstream consequence) does not match: lung carcinoma does not produce smoking. Step 2 (epiphenomenon) does not match: causal dependency is demonstrated by cessation, animal carcinogenicity and the tumour mutational signature, not mere co-occurrence. Step 3 (primary driver) matches: removing the exposure substantially prevents or delays the phenotype (cessation before middle age avoids >90% of tobacco-attributable risk; incidence falls with time since quitting), engaging the exposure initiates the phenotype (controlled animal inhalation causes lung cancer; smoking initiates a major share in humans), and the exposure is rate-limiting for the attributable share (monotonic dose-response with pack-years and daily dose). All three conditions hold within the claimed scope, so the derivation stops at step 3.",
    "tournament_used_as_tiebreaker": false,
    "note": "Primary driver is assigned from the direction-of-causation test being fully met, not from tournament rank. Necessity and sufficiency across ALL lung carcinoma are not claimed (that is the scope bound that blocks Omega); primary-driver describes smoking's role for the share it causes."
  },
  "extended_scoring_MSD": {
    "momentum": {
      "value": "Mechanistic only",
      "artifact": "Active work is mechanistic refinement (tobacco mutational-signature genomics, Alexandrov 2016; never-smoker EGFR-mutant biology, Pao 2004), not new tests of the settled causal-initiation question.",
      "justification": "The threshold-crossing causal work was done decades ago; current output refines mechanism and the never-smoker remainder rather than re-testing causation."
    },
    "stability": {
      "value": "Stable",
      "trigger": "No pending result would overturn or raise a settled top-of-ladder verdict; Omega is structurally blocked by non-necessity and non-sufficiency, and Eta is excluded by the calibration.",
      "justification": "The assessment should persist; no identifiable trigger points either way."
    },
    "divergence": {
      "implied_level": "Θ",
      "implied_level_basis": "Scientific and public-health framing presents smoking as a definitive major cause of lung cancer — a Theta-level claim, carefully bounded to 'major' rather than overstated to universality.",
      "assessed_level": "Θ",
      "gap_in_rungs": 0,
      "value": "Aligned",
      "justification": "Field framing implies Theta; assessed Theta; gap 0. This is a rare case where the field is accurately calibrated and does not overstate."
    },
    "calibration_note": "M/S/D do not modify the HSEF level or confidence."
  },
  "change_record": {
    "applies": true,
    "prior_level": "Θ",
    "prior_confidence": "High",
    "prior_source": "cigarette_smoking_lung_carcinoma_hsef_review.md (concise 3-source draft, schema_version 5.3, non-standard 'assessment' block)",
    "derived_before_consulting_prior": false,
    "new_level": "Θ",
    "direction": "unchanged",
    "what_moved_it": "Nothing moved the letter. This is a full rebuild, not a regrade: the input was a thin concise review that asserted Theta from three external sources without subclaim decomposition, cap/boundary analysis, an independence basis, or a verified source base. The rebuild independently re-derives Theta from an 18-source verified base with the full HSEF v5.4 machinery, confirming the letter and substantiating it.",
    "divergence_from_other_reviewers": "The input already reached Theta; this edition agrees on the letter and confidence but replaces the sketch with a first-class review, correcting the source base and adding the independence basis the framework requires above Zeta."
  },
  "proposed_decisive_experiments": [
    {
      "name": "Prospective cross-population dose-response with molecular confirmation",
      "experiment": "Combine harmonized lifetime-exposure cohorts across populations with tumour genome sequencing to link pack-year dose to the tobacco mutational-signature burden and to incidence.",
      "readout": "Incidence and signature burden as a function of cumulative exposure across independent populations.",
      "critical_control": "Never-smoker and radon-exposed comparison strata; adjustment for competing causes.",
      "falsifying_result": "Incidence and signature burden fail to track cumulative exposure once competing causes are controlled.",
      "supporting_result": "Monotonic dose-response of both incidence and the carcinogen signature across populations."
    },
    {
      "name": "Cessation natural-experiment with residual-risk genomics",
      "experiment": "Follow matched continuing and quitting smokers with serial risk and, where tumours arise, signature analysis, measuring how residual risk and mutational burden decay with time since quitting.",
      "readout": "Time-since-quit trajectory of incidence and of carcinogen-signature burden.",
      "critical_control": "Reverse-causation checks (exclude quitting driven by preclinical disease).",
      "falsifying_result": "Risk does not fall with cessation after excluding reverse causation.",
      "supporting_result": "Graded decline in risk and signature burden with time since cessation, with a persistent residual."
    }
  ],
  "knowledge_gaps": [
    {
      "name": "Attributable-fraction precision across tissues",
      "statement": "The exact smoking-attributable fraction varies by histology and population and is not fully resolved for every subtype.",
      "relevance": "Refines, not challenges, the 'major share' claim."
    },
    {
      "name": "Never-smoker etiology",
      "statement": "The causes of most never-smoker lung cancers beyond radon and secondhand smoke are incompletely defined.",
      "relevance": "Determines the size and biology of the non-smoking remainder."
    },
    {
      "name": "Individual susceptibility",
      "statement": "Why most smokers never develop lung cancer (host genetic and stochastic modifiers) is only partly understood.",
      "relevance": "Explains why smoking is not sufficient and bounds Omega."
    }
  ],
  "review_metadata": {
    "review_date": "2026-09-30",
    "reviewer": "Claude (Anthropic), cross-model red team and rebuild; input authored by a different model family",
    "evidence_base_note": "Primary literature 1950-2016 plus consensus reviews; every identifier resolved against PubMed. Two identifiers recalled during drafting resolved to unrelated papers and were corrected before use.",
    "literature_tools_available": true,
    "literature_tools_note": "PubMed and PubMed Central were used to resolve and read sources. Scite was not used.",
    "skill_version": "5.4",
    "validator_run": "pass",
    "validator_warnings_addressed": "Load-bearing claims registered; source tiers and status flags explicit; aggregation alternatives, caps, boundary checks, independence basis, and the five-step role derivation recorded.",
    "consensus_consistency_audit": "2026-10-09; supplementary provenance/source reconciliation; original grading retained; prior grades visible."
  },
  "is_calibration_entry": {
    "value": false,
    "entry_role": "not_calibration",
    "blind_graded": false,
    "completed_blinded_calibration": false,
    "expected_band_sealed_at": "",
    "target_sha256": "",
    "target_authorship": "No sealed calibration target was supplied.",
    "target_author_saw_review": null,
    "future_run_status": "not prepared",
    "unblinded_reason": "Full rebuild of a concise input review; the rubric names this hypothesis as a calibration case but no sealed expected band was supplied, so it is scored as a standard entry."
  },
  "upper_ladder_check": {
    "final_level_below_zeta": false,
    "equivalents_considered": [
      {
        "kind": "dose_response_across_populations",
        "available": true,
        "why_not_sufficient": "Present and carries the claim to Theta; it does not reach Omega because dose-response shows a major contribution, not necessity or sufficiency."
      },
      {
        "kind": "withdrawal_rechallenge",
        "available": true,
        "why_not_sufficient": "Cessation-linked incidence decline supports Theta; residual persistent risk and non-necessity keep it below Omega."
      },
      {
        "kind": "germline_or_somatic_genetic_natural_experiment",
        "available": true,
        "why_not_sufficient": "The tumour mutational signature and never-smoker EGFR-mutant subset support causation and bound scope but do not establish necessity/sufficiency."
      },
      {
        "kind": "therapeutic_perturbation_hard_endpoint",
        "available": true,
        "why_not_sufficient": "Animal carcinogenicity is a controlled in-vivo perturbation supporting causation; human deliberate exposure is unethical, so no mechanism RCT exists, which the framework says must not suppress the grade."
      }
    ],
    "convergence_present": true,
    "cap_reapplied_to_convergent_set": false,
    "note": "Level is Theta (above Zeta); recorded for completeness and to document why Omega is blocked."
  },
  "provenance_header": {
    "sources_total": 18,
    "claims_total": 14,
    "claims_verified": 14,
    "claims_unverified": 0,
    "claims_contradicted": 0,
    "tier_a_sources": 13,
    "generated_by": "Claude (Anthropic) cross-model red-team rebuild with HSEF v5.4; validator 2.2",
    "gate_passed": true
  },
  "claims": [
    {
      "id": "C1",
      "text": "Early controlled case-control studies (Doll & Hill; Wynder & Graham, 684 proven cases) established a strong, reproducible association between a sustained cigarette-smoking history and bronchogenic/lung carcinoma.",
      "carries_number": false,
      "load_bearing_for": [
        "SC1"
      ],
      "source_ns": [
        1,
        2
      ],
      "verification": "verified",
      "verified_against": "Primary abstracts and metadata",
      "verified_on": "2026-09-30",
      "note": "Foundational association; not by itself a causal perturbation."
    },
    {
      "id": "C2",
      "text": "In a pooled analysis of 13,169 cases and 16,010 controls, current male smokers averaging >30 cigarettes/day had odds ratios of 103.5 (95% CI 74.8-143.2) for squamous-cell, 111.3 (69.8-177.5) for small-cell, and 21.9 (16.6-29.0) for adenocarcinoma; odds ratios rose across every exposure metric and were lower for adenocarcinoma.",
      "carries_number": true,
      "load_bearing_for": [
        "SC1"
      ],
      "source_ns": [
        8
      ],
      "verification": "verified",
      "verified_against": "Complete primary full text",
      "verified_on": "2026-09-30",
      "note": "Dose-response and histology-specific magnitude from the largest pooled case-control dataset."
    },
    {
      "id": "C3",
      "text": "In contemporary US cohorts, current smokers had a lung-cancer death rate about 25 times that of never-smokers (relative risk 25.66 in women, 24.97 in men) and roughly 2.8-fold all-cause mortality.",
      "carries_number": true,
      "load_bearing_for": [
        "SC1"
      ],
      "source_ns": [
        7
      ],
      "verification": "verified",
      "verified_against": "Primary abstract and metadata",
      "verified_on": "2026-09-30",
      "note": "Cohort magnitude of the exposure-accumulation relationship."
    },
    {
      "id": "C4",
      "text": "Among 34,439 male British doctors followed for 50 years, men who smoked cigarettes from early adult life and continued died on average about 10 years younger than lifelong non-smokers, and prolonged smoking tripled age-specific mortality rates among those born around 1920.",
      "carries_number": true,
      "load_bearing_for": [
        "SC1",
        "SC2"
      ],
      "source_ns": [
        4
      ],
      "verification": "verified",
      "verified_against": "Complete primary full text",
      "verified_on": "2026-09-30",
      "note": "Prospective cohort establishing the magnitude and the cessation gradient."
    },
    {
      "id": "C5",
      "text": "Cessation reduced subsequent risk in a timing-dependent way: quitting at ages 30/40/50/60 gained about 10/9/6/3 years of life (British doctors); stopping before middle age avoided more than 90% of the tobacco-attributable lung-cancer risk (UK), and cessation before age 40 reduced smoking-associated excess mortality by about 90% (US).",
      "carries_number": true,
      "load_bearing_for": [
        "SC2"
      ],
      "source_ns": [
        4,
        5,
        6
      ],
      "verification": "verified",
      "verified_against": "Complete primary full texts and abstract",
      "verified_on": "2026-09-30",
      "note": "Exposure-withdrawal (natural-experiment) line; risk falls in proportion to time since quitting."
    },
    {
      "id": "C6",
      "text": "Former smokers retained residual excess lung-cancer risk that declined after quitting but did not fully return to never-smoker levels even about 35 years after cessation.",
      "carries_number": false,
      "load_bearing_for": [
        "SC2"
      ],
      "source_ns": [
        8,
        4
      ],
      "verification": "verified",
      "verified_against": "Complete primary full texts",
      "verified_on": "2026-09-30",
      "note": "Reversibility is partial, consistent with an initiating exposure that leaves durable damage."
    },
    {
      "id": "C7",
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