A recent from the UK involved a survey of 12,171 adults in February and March of this year. The survey found that 4.7% of ex-smokers were regularly using electronic cigarettes. Among these ex-smokers, 71% reported that they were using e-cigarettes to try to quit smoking and 48% reported that they were using e-cigarettes to try to keep off tobacco products. These data suggest that the overwhelming majority of ex-smokers using e-cigarettes are people who smoked and then quit smoking because of these products, rather than ex-smokers who returned to nicotine use via e-cigarettes.

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