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Smoking One Pack of Cigarettes Per Day Causes 150 Extra Mutations in Lung Cells Respiratory Therapy Pictures Better Than Words For Scaring Smokers off Cigarettes How to Enjoy a Cigarette (with Pictures) wikiHow 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 of Smoking and Lung Cancer Risk Don't let smoking sneak up on you! A simple calculation can tell you your pack year history., Heres how it works:, number of packs per day X number of years smoking, For example, if you smoke one

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