Formaldehyde levels in e cigarettes were previously 'underestimated', researchers find The Pharmaceutical Journal Daily exposure to formaldehyde and acetaldehyde and potential health risk associated with use of high and low nicotine e liquid concentrations Scientific Reports E cigarettes emit very high formaldehyde levels only in conditions that are aversive to users: A replication study under verified realistic use conditions ScienceDirect Composition of electronic cigarette aerosol Wikipedia Some e cigarettes deliver a puff of carcinogens The impact of e cigarette exposure on different organ systems: A review of recent evidence and future perspectives ScienceDirect