All E Cigarettes Emit Harmful Chemicals, but Some Emit More Than Others Berkeley Lab Berkeley Lab News Center Formaldehyde exposure from 3 e cigarette formats tested well below WHO quality guidelines EurekAlert! La cigarette lectronique rduit drastiquement l'exposition aux toxiques du tabac Observatoire de la prvention de l'Institut de Cardiologie de Montral E cigarettes emit very high formaldehyde levels only in conditions that are aversive to users: A replication study under verified realistic use conditions ScienceDirect