when did e cigarettes come out Vapes Out: A Brief History of E-Cigarettes – E-Cigarette | How E-Cigarettes Work,
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(accessed Aug 4, 2021)

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
We found no explicit mention of no vaping signage and whether they prohibit the use of e-cigarettes

doi:10.1016/j.cppeds.2022.101202

Interestingly, the nicotine levels found in the samples from e-cigarette users were very similar to those who used NRT and to smokers
