is smoking a pack of cigarettes a week bad 13 effects Pack-years is a way to
Pack years is a way to measure a smoker's exposure to tobacco. Higher exposure means higher risk for lung cancer. beaumont.org lung Cigarettes with health warnings could nudge smokers to butt out, researchers say The Globe and Mail What is a Cigarette Pack Year? CT Lung Scans in Las Vegas Single cigarette takes 20 minutes off life expectancy, study finds Smoking The Guardian
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