I think I remember reading something about one of the chemicals used crystalizing in the lungs, but I also think it was some chinese knock-off counterfeit vape juice and not the GoodShit©. Like how they make counterfeit electronics parts and designer purses and a million other fake things.
Crystalizing lung tissue was also one of the potential dangers of smoking menthol cigarettes.
Virtually inhaling anything can be hazardous to health in some way. You are correct about the counterfeit/cheaper stuff being the worst stuff.
IIRC, there was a hair on fire ban of all flavored vape juices as soon as some kids got sick without any real research into what was making them sick. It was likely caused by “black market” products, including the hardware, but since it’s easier to just ban the products that aren’t fueling your re-election bid, that was what they did.
Nobody remembers John Boehner handing out checks from tobacco lobbyists ON the fucking floor of the House of Representatives.