Does sound normal for a mix. You may have issues with one particular flavoring. Some do. IIRC custards are one it can happen with.
Yeah, he gave me a 10ml of the Butterscotch Tabaco to tide me over for now. Do you know any good places I can get supplies to make my own juice? He recommended a website, but if there's a place I can go in person so I don't have to deal with shipping and all that I would prefer it.