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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.

> often spend many hours per day for most of their career

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.

No. But that might be an unfair comparison.

People vape by choice.

Smoke machines on the other hand have more in common to going to a restaurant or bar back in the day and being subjected to other people's second hand smoke.

You go to a venue for music or something similar, and get exposed to smoke machines.

Never have I ever heard anyone say, we should go to a concert or night club because - smoke machines!

It may be common for workers in some businesses to be exposed to smoke machines on a daily basis.