E cigarettes can emit formaldehyde at high levels under conditions that have been reported to be non averse to users Scientific Reports Selected Harmful and Potentially Harmful Constituents Levels in Commercial e Cigarettes Chemical Research in Toxicology Vaping is definitely a cancer risk' Formaldehyde is used to preserve dead bodies. This same cancer causing chemical is also found in vape juices. Vaping may look harmless, but looks can be deceiving.