Some e cigarettes deliver a puff of carcinogens Formaldehyde exposure from 3 e cigarette formats tested well below WHO quality guidelines EurekAlert! What's really inside a vape? Many people think vaping is just flavored vapor, but the aerosol from e cigarettes can contain harmful substances that go straight into the lungs. According to the Frontiers Carbonyl Emissions in E cigarette Aerosol: A Systematic Review and Methodological Considerations Myth vs. Fact Myth: Vaping is just flavored water" Fact: Vape aerosol contains heavy metals, formaldehyde, and nicotineall inhaled directly into your lungs and can cause breathing problems, lung disease and cancer. Formaldehyde In Vapes? Exposing Another Chemical Scare