Among the uninformed, confused, and genuinely concerned, I think there are also those people that I think of as the "Puritans." Puritans don't like, on principle, that people choose to drink, smoke cigarettes, smoke pot, vape, or do anything that might alter their brain chemistry in a way they enjoy...
I've noticed an increasing trend of "conformist intolerance".
The trend to prohibit everything that isn't mandatory.
"Egalitarianism" distorted into "sameness".
While people pay lip-service to "diversity" for PCism, the actual support for anything out of the ordinary seems to be in decline.
Remember when the teacher would say (about gum), "I hope you brought enough for everyone"?
Boy, Is He Strict Scene - Blazing Saddles Movie (1974) - HD - YouTube
Just try driving a car with a big wing on the back, and see how much hostility you get.
Oh, and PG *is* used as anti-freeze: Many towns use it to winterize their drinking fountains.

And the "pet friendly" antifreeze sometimes substitutes PG for the toxic ethylene glycol in "normal" automobile antifreeze. (I wouldn't vape even the pet friendly antifreeze -- there are still a bunch of other chemicals in it.)
PG is also used as the base for many FDA approved artificial flavors.
I looked it up, the first time I saw some medication was carried on a PG base.
The FDA charges the tobacco industry over $200M a year (rising to $712M in 2019) in "user fees": the tobacco industry has to pay the FDA to regulate them. Of
course the FDA doesn't like people moving away from tobacco.
Consider the implications when the FDA says it wants to "regulate" vaping "like tobacco".
