Earlier quoted context omitted.
> smoke machines will be banned Do people put smoke machines up to their mouths and inhale it many times a day over many years?
Theater technicians and performers often spend many hours per day for most of their career in close proximity to large smoke machines - essentially huge mains-powered e-cigarettes that use nicotine-free vape juice by the quart.
Assuming you mean running smoke machines, no they don't. Smoke machines are occasionally used, but not in most plays, let alone for hours. And even if the were, most actors rehearse for weeks or months between plays, and nobody is using a smoke machine on rehearsals, except maybe in the last few.