Koop Director Commentary: This is one of a number of studies in which e-cigarette use among adults trying to quit smoking impaired the ability to quit using cigarettes. My smoking cessation colleagues often counter that this finding is not surprising because smokers who try e-cigarettes are the ones that have more trouble quitting. This study is special because the investigators did a really good job of accounting for other variables that predict poorer quitting outcomes, like smoking intensity. After accounting for these factors, the difference was quite large: 23% of those who did not use e-cigarettes were able to completely abstain from smoking compared to only 10% for those who use e-cigarettes.
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