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How Many Cigarettes in a Pack? (2025 Guide) Pack years is a way to measure a smoker's exposure to tobacco. Higher exposure means higher risk for lung cancer. beaumont.org lung 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 It Doesn't Take Much Smoking to Kill You, Study Finds
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