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Does switching from cigarettes to e-cigarettes facilitate smoking cessation? Researchers investigating the incidence of relapse among smokers who had switched to e-cigarettes or other tobacco products found no evidence that switching prevents a relapse to cigarette smoking. [...] The researchers conducted a cohort study of smokers who smoked but had recently quit. They collected data from the US Population Assessment of Tobacco and Health (PATH) study, using 4 annual waves from the Path study to identify 2 cohorts of people who had recently quit smoking cigarettes and who completed 2 follow-up surveys. [...]