What are possible hazards of fog machines?
Given that these machines have been used extensively in the entertainment industry for decades, and one (Rosco Fogger) even has an Academy Award, common sense says that they aren't dangerous.

Breathing in copious quantities of the fog causes irritation, but that applies to a lot of things. Dry ice fog[1] is basically water vapour - fill the room with it and you die from asphyxiation from the CO2


looks better in many cases as it's "fog" and not "smoke"