how many cigarettes a day is considered a light smoker Prevalence (%) of Heavy Smoking vs Smoking, Ages 25-64,1985; Social smoking: Will an occasional

Social smoking: Will an occasional cigarette damage your health? ABC News 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 Cigarettes Do You Need to Smoke to Get Cancer? Light smoking at base line predicts a higher mortality risk to women than to men; evidence from a cohort with long follow up BMC Public Health Springer Nature Link

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