I was in a pinch once and the localcake supply store was actually out of flavorings, so I scooted down to the Krogers and I got raspberry flavoring, it was slightly colored a really really light pink color, and i vaped it for a few days till my flavors came in, nothing happend to me..personally i dont think food coloring is that big of an issue if it int a lot of it in there, about all that will happen is you may gunk up your atty faster...like chocolate flavorings