The impact of e cigarette exposure on different organ systems: A review of recent evidence and future perspectives ScienceDirect Formaldehyde in e cigarettes expert responds Science Media Centre E cigarette Safety is a Smoke Screen. E cigarette vapor has cancer causing chemical formaldehyde CBS News Going completely smoke free is difficult for many, but did you know that nicotine has been found in e cigarette liquids claiming to be 'nicotine free?' While e cigarettes don't contain tobacco, they may still E cigarettes emit very high formaldehyde levels only in conditions that are aversive to users: A replication study under verified realistic use conditions ScienceDirect