e cigarettes parts of an electronic cigarette (a) and statuses of e-cigarettes when Vaping

While e-cigarettes are generally considered less harmful than traditional cigarettes, especially because they do not produce secondhand smoke like burning tobacco does, they are not completely risk-free

In vitro studies, ADSC-conditioned medium culture effectively reversed CSE-induced decreased E-cadherin expression, increased Vimentin expression, and accelerated cell migration in A549 cells [178]

The 4,000+ chemicals in tobacco smoke result primarily from combustion itself, not from differences in the raw tobacco

doi:10.1136/oem.59.10.708

This is due to the risk of battery combustion, which is higher in the unmonitored cargo hold

[2] Some users of electronic cigarettes modify their devices to inhale large amounts of vapour at once, to exhale "clouds" in patterns like smoke rings