Sweet E cigarette Flavored Liquids Could Increase Your Tooth Decay Risk Harmful Chemicals in Vapes and E Liquids You Should Avoid SMOKO E Cigarettes Have you ever breathed in secondhand vapor from a vape? What exactly are you inhaling? It turns out it's a lengthy list of chemicals. FULL STORY New study reveals the worst e cigarette flavor to inhale and it's a popular one Vaping releases toxic chemicals, including heavy metals, as well as ultrafine particles that go deep into the lungs. These increase the risk of heart and lung disorders.