If you look at the air quality analysis of a populated city, IMO the air we breath can kill you. On high smog day's people go outside in masks, and some people will not go out at all. As far as vaping flavors, I do not know what the long term effects will be. I believe do believe however, that if there were some negative effects of flavoring being vaped on the body there would be at least some evidence of it. I know that vaping is still "new" but if someone were to use analogs for 5 years on a daily bases there would be some negative impact to their health. If anything, ivaping has improved the quality of life for people who were on analogs. I will not say that it is 100 % safe, but I do humbly believe that its is 99% safer then smoking.
Agree. But diacetyls are dare I say a bit like asbestos, and the harm appears much later. Very unusual. One feels it if breathe tar, monoxide, etc, or allergies to colors or PG, but there a few silent killers and those are the dangerous ones. Diacetyls are the only thing that falls into that category that i know of. 99% safer? Sure thing.