Flavorings that i know are food grade:
FA
TPA/TFA
Loranns
Capella
So any of those...
From the post above, i must not use flavorings made for vaping for most my stuff.
From the TPA website:
"Inhalation of flavor chemical blends by use of electronic cigarettes
is a popular and more chemically pure alternative to traditional
tobacco smoking. However, please note that this use of our products
is a relatively new practice, and has not been safety-tested by any
official organizations."
I'm pretty sure that investigation of the other suppliers will show similar disclaimers. What you "know" and what you can prove seem to be different here. Using best practices and food grade ingredients is NOT the same as a product being "food grade" per FDA requirements. Flavor Art isn't even required to meet these standards, since they're in Italy.
I would never recommend adding flavouring made for vaping to medicines, this decision must be made entirely by the end user based on their own research. Again, this is not the same as me saying it's unsafe, but the legal minefield this may open up isn't worth the hassles.
According to my reading of the psychotic laws, to make such a recommendation is tantamount to practicing medicine without a licence.