A final, important benefit of smoking reduction is that it helps facilitate the possibility that a smoker will subsequently be able to quit. It reduces the level of smoking addiction. It is easier to quit from a level of 5 cigarettes per day than it is to quit from a level of 30 cigarettes per day.

The Marini study demonstrates that electronic cigarettes do lead to a reduction in exhaled nitric oxide, which suggests that they have a mild respiratory irritant effect and induce some inflammation in the airways. This is a finding which has been reported previously in a number of studies. It is not surprising because propylene glycol is known to be a mild respiratory irritant.

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