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21st Century Hazards of Smoking and Benefits of Cessation in the United States New England Journal of Medicine Smoking and Vaping Among Adults Prevalence (%) of Heavy Smoking vs Light Smoking, Ages 25 64,1985; Download Table Cigarette smoking classified based on the number of cigarettes smoked Download Scientific Diagram 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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