Almost all of the studies have been paid for by the e-cigarette companies. And the WHO claim that the research is independent. Research that passive exposure to e-cigarette vapour is "as safe as or. "Had the study in question actually evaluated the safety of electronic cigarettes, by analyzing the constituents of the e-cigarette vapor or the. On the safety of Ruyan electronic cigarette cartridges. "This is the first evidence that just one e-cigarette use can have acute.
