does smoking 4 cigarettes a day bad Smoking: How many is bad? 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 Top 10 Terrible Things Smoking Does to Your Body Just one cigarette a day is 'almost as dangerous as 20 hiking your heart attack and stroke risk by 40%' Pack Years of Smoking and Lung Cancer Risk Just 6 to 10 Cigarettes per Month Tied to Higher Risk of Death Cancer Health
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