Heated Tobacco Products, Cigarettes, and E Cigarettes: What's the Difference PMI Science E Cigarettes, Vapes, and other Electronic Nicotine Delivery Systems (ENDS) FDA Vaporizing Lung Injury NUEM Blog 5 Vaping Facts You Need to Know Johns Hopkins Medicine 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.