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How many smokers are there worldwide? What is the definition of a heavy smoker? how many cigarettes is considered a heavy smoker how many cigarettes a day is a heavy Smoking One Pack of Cigarettes Per Day Causes 150 Extra Mutations in Lung Cells Respiratory Therapy Pack years is a way to measure a smoker's exposure to tobacco. Higher exposure means higher risk for lung cancer. beaumont.org lung Characteristics of light moderate (less than 20 cigarettes per day) and Download Table
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