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Adult respondents who reported ever cigarette smoking, defined as smoking at least 100 cigarettes in their lifetime, were asked, How old were you when you first started smoking cigarettes fairly regularly? Responses were used to create 2 separate variables: one with 3 categories, which included adults who never smoked, those who began smoking before age 15 (childhood smoking), and those who began smoking after age 15

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Urinary levels of tobacco-specific nitrosamine metabolites in relation to lung cancer development in two prospective cohorts of cigarette smokers

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