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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 One cigarette per day enough to increase risk for heart disease, stroke Burden of Cigarette Use in the U.S. Data and Statistics Campaign Resources Tips From Former Smokers CDC Average number of cigarettes smoked per hour of the day, maximum Download Scientific Diagram Light Smoker vs. Heavy Smoker: Are Dangers the Same?

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