i smoked a pack of cigarettes Pack-years is way to measure a smoker's exposure to tobacco. Higher exposure means higher risk for lung cancer. beaumont.org/lung What is a “Pack Year”?
What is a Pack Year? Lung Cancer Kilts Research Cures! Reaching for that pack of smokes? You aren't the only one. The New York Times It Doesn't Take Much Smoking to Kill You, Study Finds How Many Cigarettes Are in a Pack? A Comprehensive Guide
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