During 1965–2012, the prevalence of cigarette smoking among adults (aged ≥18 years) in the United States decreased from 42.4% to 18.1%, partly because of increases in smoking cessation (1,2). Quitting smoking is beneficial to health at any age, and cigarette smokers who quit before age 35 have premature mortality rates similar to those of persons who never smoked (1,2).
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