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Light smoking at base line predicts a higher mortality risk to women than to men; evidence from a cohort with long follow up BMC Public Health Springer Nature Link Average number of cigarettes smoked per hour of the day, maximum Download Scientific Diagram Smoking: Effects, Risks, Diseases, Quitting & Solutions Many people think smoking only on the weekends or at parties is harmless, but doctors warn there is no safe amount of tobacco. Find out how even occasional smoking damages your heart Pack years is a way to measure a smoker's exposure to tobacco. Higher exposure means higher risk for lung cancer. beaumont.org lung Single cigarette takes 20 minutes off life expectancy, study finds Smoking The Guardian

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