As the authors point out: "Of interest, consistent improvements in subjective and objective asthma outcomes were also observed amongst dual users (i.e., heavy reducers) with no real difference in dual compared to single users by the end of the observation period."

The relative safety of e-cigarettes over tobacco cigarettes is their primary selling point.

Yesterday, a group of international lung health organizations issued a position statement on electronic cigarettes, which called for a ban (or severe restrictions) on these products until more is known about their health effects. In contrast, these organizations did not express any problem with real tobacco cigarettes remaining on the market, even though they kill millions worldwide each year, and electronic cigarettes are not known to have killed a single person ever.

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