It is easy to see why this methodology is inappropriate to assess smoking cessation rates among smokers who use e-cigarettes in an attempt to quit smoking.

The study examined 18 smokers with significant asthma who switched to electronic cigarettes. Ten of the patients switched completely and 8 became dual users (both smoking and using e-cigarettes). Among the dual users, the average cigarette consumption dropped from 22.4 to 3.9 cigarettes per day.

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