Please quantify and give references to support your first two sentences.  They misrepresent the bulk of the research done in this area.  E-cigarette use amongst adolescents in not believed to be "growing rapidly" unless your standards for that are set extremely low, and almost no public health experts are concerned with the "gateway" theory which has been widely discredited in the addictions field for many years now.  E-cigarette use has huge potential as a harm reduction measure for smokers, and that potential is undermined by alarmist and inaccurate articles. The important numbers to report from this study would have been those "after being adjusted for smoking and secondhand tobacco smoke exposure and sociodemographic factors", ie the paper's true results.  Presumably they weren't dramatic enough for you.