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Pack years is a way to measure a smoker's exposure to tobacco. Higher exposure means higher risk for lung cancer. beaumont.org lung How Many Cigarettes A Day is Heavy Smoking? Know the Figures How Do I Know I'm Really Addicted to Nicotine? Light and Social Smoking Carry Cardiovascular Risks Harvard Health Publishing Harvard Health Single cigarette takes 20 minutes off life expectancy, study finds Smoking The Guardian
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