• Allison M Glasser, Lauren Collins, Jennifer L Pearson, Haneen Abudayyeh, Raymond S Niaura, David B Abrams, and Andrea C Villanti.
• The Schroeder Institute for Tobacco Research and Policy Studies at Truth Initiative, Washington, District of Columbia. Electronic address: aglasser@truthinitiative.org.
• Am J Prev Med. 2017 Feb 1; 52 (2): e33e66e33-e66.

ContextRapid developments in e-cigarettes, or electronic nicotine delivery systems (ENDS), and the evolution of the overall tobacco product marketplace warrant frequent evaluation of the published literature. The purpose of this article is to report updated findings from a comprehensive review of the published scientific literature on ENDS.Evidence AcquisitionThe authors conducted a systematic review of published empirical research literature on ENDS through May 31, 2016, using a detailed search strategy in the PubMed electronic database, expert review, and additional targeted searches. Included studies presented empirical findings and were coded to at least one of nine topics: (1) Product Features; (2) Health Effects; (3) Consumer Perceptions; (4) Patterns of Use; (5) Potential to Induce Dependence; (6) Smoking Cessation; (7) Marketing and Communication; (8) Sales; and (9) Policies; reviews and commentaries were excluded. Data from included studies were extracted by multiple coders (October 2015 to August 2016) into a standardized form and synthesized qualitatively by topic.Evidence SynthesisThere were 687 articles included in this systematic review. The majority of studies assessed patterns of ENDS use and consumer perceptions of ENDS, followed by studies examining health effects of vaping and product features.ConclusionsStudies indicate that ENDS are increasing in use, particularly among current smokers, pose substantially less harm to smokers than cigarettes, are being used to reduce/quit smoking, and are widely available. More longitudinal studies and controlled trials are needed to evaluate the impact of ENDS on population-level tobacco use and determine the health effects of longer-term vaping.Copyright © 2016 American Journal of Preventive Medicine. Published by Elsevier Inc. All rights reserved.

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