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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 Fewer Americans Think Smoking A Pack A Day Poses A Great Health Risk Duke Health of a pack of cigarettes my friend had. : r AbsoluteUnits How Many Cigarettes Are in a Pack? A Comprehensive Guide Pack Years of Smoking Practicing Clinicians Exchange
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