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How Many Cigarettes in a Pack? A Complete Guide for Smokers Graphic Warning Labels on Cigarettes Are Scary, but Do They Work? RAND 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 years is a way to measure a smoker's exposure to tobacco. Higher exposure means higher risk for lung cancer. beaumont.org lung

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