how many cigarettes is considered a heavy smoker smokers say they smoke 10, 20, 5, or 15 day. #WorldNoTobaccoDay What is the definition of
What is the definition of a heavy smoker? Tobacco smoking Wikipedia Light Smokers May Not Escape Nicotine Addiction, Study Reveals Duke Department of Psychiatry & Behavioral Sciences 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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