Waiting for a DIY starter kit but I have a question. I already have some Chefs Vapour Captain Custard concentrate. Web site instructs to mix at 20%. Fine. So is this only a flavouring? If so, why is the bottle labelled 12mg nic, PG/VG 50/50 with a nicotine warning on the bottle? What I've been doing with it is mixing 20 parts to 80 parts of a ready mixed 50/50 12mg vanilla. Have I completely misunderstood this? The resulting mixture vapes fine ...