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Description
it is a medical recommendation backed by solid evidence

United States E-Cigarette Market Share, By Distribution, for the year 2018

Cigarette smoking had become common among young men in Britain by the end of the first world war (1914-1918) and remained so for half a century, 18 reinforced by the issue of low cost cigarettes to young military conscripts from 1939
doi: 10.1113/JP279754 19
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It's a detail that raises questions about the robustness of these devices and the variability in their manufacturing
