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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 Why is smoking bad for you? What is a Pack Year? Lung Cancer Kilts Research Cures! Smoking One Pack of Cigarettes Per Day Causes 150 Extra Mutations in Lung Cells Respiratory Therapy Smoking: Effects, Risks, Diseases, Quitting & Solutions What happens to your body when you quit smoking : r coolguides
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