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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 do you guys smoke a day? What do you consider a heavy smoker? And do you enjoy smoking or smoke out of habit? : r Cigarettes Smoking One Pack of Cigarettes Per Day Causes 150 Extra Mutations in Lung Cells Respiratory Therapy How many smokers are there worldwide? Why Smoking ANYTHING Can Cause Lung Cancer Smoking: Effects, Risks, Diseases, Quitting & Solutions
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