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Don't epidemics usually create sick people? I realize the counter-argument will of course be "we don't know the long-term effects," but people have been exposed to aerosolized glycerine/propylene glycol for decades in the form of fog machines at concerts and clubs. Surely if this was the next asbestos we'd be seeing something by now.

How many people spend a significant percentage of their time right next to a fog machine breathing in highly concentrated amounts?

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