Should Vaping Be Banned? The Atlantic this vape liquid can kill you if you get it on your skin apparently : r mildlyinteresting Nic Sick: The Dangers of Youth Vaping What Does Vaping Do to Your Lungs? Johns Hopkins Medicine 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. 22 people have been hospitalized with vaping linked breathing problems. Doctors don't know why.