Cherry picked flavors. Doesn't say the chemicals, so it's safe to assume they are chemicals everyone knows (or should know by now) are risky.
Note the study does go by chemicals, diacetyl, cinnamaldehyde, acetoin, pentanedione, o-vanillin, maltol and coumarin. How long have we known about those and good vape flavoring companys take measures to avoid them?
It's not the blanket flavors, it's the chemicals some of those flavors use.
I would hate to be the one to inform them there's inhalation going on with cooking, baking and eating.