About E Cigarettes (Vapes) Smoking and Tobacco Use CDC E cigarettes almost always contain nicotine. Vaping can expose you and others around you to harmful chemicals, such as: Carbonyl Compounds Generated from Electronic Cigarettes E cigarette aerosols contain many dangerous metals and chemicals things that our lungs were never meant to inhale. One such chemical you might not be aware of is formaldehyde, which can be released as Do Juul Pods Contain Formaldehyde It's not just vapor. Your vape could contain the same amount Formaldehyde levels in e cigarettes were previously 'underestimated', researchers find The Pharmaceutical Journal