A World Health Organisation report has found that the levels of toxins emitted by electronic cigarettes - officially known as electronic nicotine delivery systems (ENDS) - is in the range of those produced by ordinary cigarettes, putting non-smokers at risk.
The fact that ENDS exhaled aerosol contains on average lower levels of toxicants than the emissions from combusted tobacco does not mean that these levels are acceptable to involuntarily exposed bystanders.
In fact, exhaled aerosol is likely to increase above background levels the risk of disease to bystanders, especially in the case of some ENDS that produce toxicant levels in the range of that produced by some cigarettes.
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