is smoking 5 cigarettes a day bad Single cigarette takes 20 minutes off life expectancy, study finds | Tobacco smoking - Wikipedia
Tobacco smoking Wikipedia Smoking a pack a day for a year causes 150 mutations in lung cells 5 cigarettes a day really bad Smoking One Pack of Per Causes 150 Extra Mutations in Lung Cells Single cigarette takes 20 minutes What is the safe daily cigarette limit? Pack Years of Smoking and Lung Cancer Risk Just 2 cigarettes a day 'increases risk of early death by 60%' and it's bad news if you're 'cutting back'
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