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Distribution of FEV1 among light smokers and heavy smokers, COPD, and lung cancer.10,12–14 (A) Light or never smokers (0–20 pack-years). (B) Heavy smokers (60+ pack-years) – COPD versus “resistant smokers”. (C) Heavy smokers (60+ pack-years) – Lung cancer.
Abbreviations: COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in one second.
