The study is also notable because it found no adverse effects of electronic cigarettes on respiratory health among the vulnerable subpopulation of asthmatic patients examined.

The study enrolled 1,074 patients with cancer who were smokers and were therefore referred to a tobacco treatment program at a comprehensive cancer center during the years 2012 and 2013. Smoking status, nicotine dependence, and e-cigarette use was assessed at baseline and the patients were followed for six-month. The primary outcome was smoking cessation, measured as seven-day abstinence at follow-up.

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