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We call those other factors confounders of the relationship between smoking and lung cancer

PMID: 21177367

Unlike conventional cigarettes, e-cigarettes produce no tar or harmful combustion byproducts, making them a cleaner and more convenient option for adult Canadians

The Smoking in Pregnancy Challenge Group approach this in a non-alarmist fashion that is so often read about in sensationalist reports: The great majority of the harm from smoking comes from inhaling tobacco smoke which contains around 4000 chemicals, a significant number of which are toxic

It is the lips that give the most detail to show a lit cigarette in someone's mouth