is one pack of cigarettes a year bad This equates to nearly 7 hours life lost when smoking an average of 20 cigarettes." What is the pack-year equivalent

What is the pack year equivalent of smoking half a pack (pack) of cigarettes per day for 40 years? Social smoking: Will an occasional cigarette damage your health? ABC News Pack years are a unit of measurement used to estimate the amount a person has smoked over their lifetime. It is calculated by multiplying the number of packs of cigarettes smoked per Pack year: What do they tell about your lung and heart health

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