chief risk factor is smoking cigarettes Health Effects of on Your Body Cigarette smoking and lung cancer
Cigarette smoking and lung cancer relative risk estimates for the major histological types from a pooled analysis of case control studies PMC How does smoking cause cancer? Cancer Research UK What a drag: The dangers of a daily cigarette Harvard Health Health effects associated with smoking: a Burden of Proof study Nature Medicine Why the Father of Modern Statistics Didn't Believe Smoking Caused Cancer Priceonomics
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