In summary, this study helps to alleviate concerns raised by prior research and does not raise any new concerns. While more research is clearly needed, especially because there are so many different brands of electronic cigarettes on the market, the current evidence does not point to any substantial health hazards associated with passive vaping.

"Only 1.8% of children are regular users; 90% of regular or occasional users are young people who are already smokers or ex-smokers; 91% of young people have not tried an electronic cigarette even once; and this is despite the fact that over 80% of young people are now aware of e-cigarettes (up from under 70% in 2013)."

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