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Heart rate was a factor in this study finding that cigarettes and chewing tobacco had the highest bpm (36 and 35), oral tobacco was slightly lower (29), and nicotine gum came in the lowest (19)

Chishimba L, Niven R, Fraczek M, Bowyer P, Smyth L, Simpson A, Denning D

But there are several reasons why doctors do not recommend e-cigarettes as a means of smoking cessation

Levy DT, Tam J, Sanchez-Romero LM et al (2021) Public health implications of vaping in the USA: the smoking and vaping simulation model

The variable speed controller can be mounted in the unit or can be mounted into a wall switch in another location