Harmful Chemicals in Vapes and E Liquids You Should Avoid SMOKO E Cigarettes Vape Juice Ingredients Explained: What's Really in Your E Liquid? Ecigator How Vape Juice Is Made? Vape juice contains a long list of chemicals, many of which aren't even listed on the packaging. Testing has also shown that vapes labelled "nicotine free" can have high nicotine levels. Vaping isn't just harmless vapor. It delivers toxic and addictive chemicals into your body, which can lead to serious health problems. Talk to your teen about the harms of vaping today! Do you know what you're vaping? Propylene glycol (PG) and vegetable glycerin (VG) are the main liquids in vapes. When heated, these chemicals turn toxic and aren't safe to breathe.