how many cigarettes a day is considered heavy smoker Pack Years of Smoking and Lung Cancer Risk Mortality in relation to smoking:
Mortality in relation to smoking: 50 years' observations on male British doctors PMC Prevalence (%) of Heavy Smoking vs Light Smoking, Ages 25 64,1985; Download Table Current Cigarette Smoking Among Adults United States, 2016 MMWR Tobacco smoking Wikipedia Am I safe smoking 2 to 3 cigarettes a day?"
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