Public Health England, the equivalent of the FDA in the U.K., stated in 2015 that while vaping may not be 100% safe, most of the chemicals causing smoking-related disease are absent and the chemicals that are present pose limited danger. This statement did not consider the fact that health effects of inhaling flavoring chemicals contained in popular e-cigarettes are completely unknown, or that heating liquids in these devices causes thermal decomposition of those e-cigarette chemicals that pose limited danger into known toxicants
Smokeless tobacco went into decline for a couple of reasons, including the rise of cigarettes and fear of disease
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"A smoke-free generation is now within reach, and this government is determined to deliver a healthier, fairer future for everyone."
The majority could be attributed to humans, though only 8% were caused by arson
doi: 10.1093/clipsy.bpg016 53 KallioH.PietilA.-M.JohnsonM.KangasniemiM