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Smokers "Pack Year" Calculator Vaping Calculator To assess a smoker's lung cancer risk, think years not packs Harvard Gazette smoking 3 cigarettes a day Cardiologists Lack Resources to Help Hospitalized Patients Quit Smoking Pack year Wikipedia 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
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