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They are expensive because they are a small market. Fog machines function differently than vapes. They don't use wicks, they have a dense high output, large storage capacity.
I know people who have reactions to the PG in the vape solution. Pg is used as a carrier for flavors and nicotine and VG is more for fog. Mostly industry fog machines use just PG
Building a Small Format Vacuumformer from an Old Toaster Oven