E Cigarette Smoking May Release Formaldehyde, Other Carcinogens AboutLawsuits.com New study comes the closest yet to proving that e cigarettes aren't as dangerous as smoking Pediatric Environmental Health Center E Cigarettes Boston Children's Hospital Vapes don't produce harmless water vapor. They can contain addictive nicotine, cancer causing chemicals like acetaldehyde and formaldehyde, and heavy metals that don't belong in your body. Live Vape Free is a text Vapes are not harmless. Formaldehyde, vitamin E acetate, and heavy metals are just a few of the chemicals found in e cigarettes. Our youth deserve the truth and the tools to make informed