Warning label on my bottle of vape juice : r whatisthisthing UNDERSTANDING E LIQUID INGREDIENTS AND FLAVOURS NYX Vape Canada What's in an e liquid or vape juice? The main ingredients are propylene glycol (PG) and vegetable glycerine (VG). These are solvents that are basically used to dissolve and carry the other ingredients. I was stood in the kitchen, minding my own business and noticed my partners vape juice on the side. I found myself with nothing better to do than to read the ingredients