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However, not only nicotine-containing e-cigarettes are widely popular

If we would make forbidden all that science has deemed potentially destructive, well are lives would be a lot less interesting(or more depending on how one sees it) This may not answer all your points, but bear in mind that smoking is inherently dangerous, whereas some of the things you mention (e.g

Researchers are looking into how nicotine interferes with Covid-19 molecules seeking to bind to the same receptors

There is also a timer provided as 3 tubes require reading at 5 minutes and the oil at 24 minutes

As a result, the FAA decided it was safer for passengers to transport their e-cigs in carryon luggage so if a problem with an overheating battery does arise, it can be addressed immediately with less chances of flight interruption