diacetyl in cigarettes vs vape While vaping is not risk-free, it is less harmful than tobacco Rethinking Vaping

The standard research figure is 1 to 1.5 mg of nicotine absorbed per cigarette (Benowitz), and the National Institute on Drug Abuse gives 1 to 2 mg, while e-cigarettes have been measured anywhere from about 1 to 10.6 mg over the same 20 puffs, depending enormously on the device and the liquid

Occasional intake is not a health problem, he says

World Trade 571, 580-81 (2009)Google Scholar

The research still raises concerns that smokers could be lulled into a false sense of security

This is opposed to combustion, which creates vapor as well, but also produces smoke from the breakdown of the tobacco leaves, paper and other contents of a cigarette