but they’re still carcinogenic

...Because of the nicotine. Nicotine is a known carcinogen on its own. Propylene glycol and Glycerol are not. Of course it is possible to make vape juice with other additives that happen to be carcinogenic but those can be omitted. There have been studies showing it's possible for vaping to irritate the airways but from what I was reading I didn't see any hard links between that and serious health outcomes, or that this always necessarily happens.

So as best I can tell, my statement is correct, the main thing about vaping that is bad for you is the nicotine, and I wasn't able to find evidence that other (necessary) aspects of it are inherently harmful in a serious way. If you could provide evidence of that I'd consider it.