What's REALLY in your cigarette or vape? You're not just inhaling nicotine. Cigarettes contain arsenic, ammonia, and formaldehyde yes, the same stuff used to embalm bodies. Vapes? Heavy metals, toxic chemicals, Health Effects of E Cigarettes Kansas Health Institute E Cigarette, E Cigar Research: More Formaldehyde Than Tobacco Glamour E cigarettes emit very high formaldehyde levels only in conditions that are aversive to users: A replication study under verified realistic use conditions ScienceDirect Chemical characterisation of the vapour emitted by an e cigarette using a ceramic wick based technology Scientific Reports