The article from sciencedaily does make you wonder, if one chemical is found to have problems and they replace it, then the next one is found to have issues and

The article from sciencedaily does make you wonder, if one chemical is found to have problems and they replace it, then the next one is found to have issues and they replace that, is there really anything that can be vaped which doesn’t affect various respiratory systems poorly? Maybe flavorless water vapor. I’d suspect there is a line where negative outcome has to be drawn, as in “doing this is certainly bad and you will almost surely get sick” versus “continued use over many years results in at least 1/3 of users developing lung problems or diseases related to usage”.