Vaping Marijuana Causes More Lung Damage Than Vaping or Smoking Nicotine Vaping delivers heated chemicals directly into the lungs. Unlike air, vape aerosols contain fine particles, nicotine, heavy metals, and flavoring compounds that were never designed to be inhaled. Once inside the chest, Another Gross Reason to Put Down the E Cigarettes American Lung Association 4,304 Lungs Vaping Royalty Free Images, Stock Photos & Pictures Shutterstock The safest vape is the one you never start. Flavoured vapes were designed to feel harmless: Candy taste. Fruit smell. Cool packaging. Viral aesthetics. But your lungs don't care about the flavour.