"Analysis of indoor air quality during vaping sessions showed that e-cigarettes are not emission-free." This was the second time the authors used this phrasing to summarize their findings. Right now, that e-cigarettes are not emission free appears to be about the most alarming thing that can be said about them.

This study confirms that in the UK, despite substantial experimentation with e-cigarettes by youth, this experimentation does not appear to be leading to regular e-cigarette use by a large proportion of youth, and those who are regular users are overwhelmingly youth who are already smokers or who smoked in the past.

3. "With regard to the seven PAH classified as probable carcinogens by the IARC, the concentrations increased on average by 20% from 122.8 ng/m3 (control) to 147.3 + 26.2 ng/m3."

If the FDA is not sure that removing all of the carcinogens from cigarettes - and reducing their concentrations to no more than trace levels - is going to make "smoking" safer (even forgetting the fact that there is no smoke and no combustion associated with vaping), then one has to ask whether the FDA is basing its positions only on science, and not on any political or ideological concerns.

For two reasons.

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