What is e-liquid made out of?

What is E-Liquid made out of?  That’s a question that many people seem to be confused about. From well-meaning vapers who say “It’s just water vapour” (it isn’t) to tobacco control fanatics yelling, “We don’t know what’s in it” (we do), misinformation and weird beliefs about vaping is the wide choice of delicious-tasting juices, and that’s all down to flavourings. Liquid doesn’t have much taste on its own, so it’s flavoured with food-grade additives.

If there are any health concerns about vaping that’s mostly down to flavourings. There are some ingredients that are safe to eat but not to inhale –