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.

This assertion is based on a new study which found that electronic cigarette use, like smoking, results in reduced levels of exhaled nitric oxide. As Dr. Glantz writes:

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