Liquid nicotine used in e cigarettes still a danger to children despite recent decline in exposures A handful of companies control most of the global tobacco market, and today they look very different from the cigarette giants people remember. By market value, Philip Morris International sits clearly at Vape Juice Ingredients: All You Need to Know Imperial Tobacco accused of cheap Laos product deal 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.