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Comparing the Effects of Electronic Cigarette Vapor and Cigarette Smoke in a Novel In Vivo Exposure System
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Electronic cigarettes for smoking cessation.

Jamie Hartmann-Boyce1, Hayden McRobbie2, Nicola Lindson1

  • 1Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK.

The Cochrane Database of Systematic Reviews
|October 14, 2020
PubMed
Summary
This summary is machine-generated.

Electronic cigarettes (ECs) with nicotine can help smokers quit, showing higher quit rates compared to nicotine replacement therapy (NRT) or non-nicotine ECs. Evidence suggests potential benefits but calls for more research on modern EC products and safety.

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Area of Science:

  • Public Health
  • Addiction Medicine
  • Respiratory Medicine

Background:

  • Electronic cigarettes (ECs) are vaping devices used by smokers attempting to quit or reduce smoking.
  • Debate exists regarding EC efficacy and safety for smoking cessation, with varying opinions from organizations and policymakers.
  • This review updates previous findings on ECs for smoking cessation.

Purpose of the Study:

  • To evaluate the effectiveness of electronic cigarettes (ECs) in achieving long-term smoking abstinence.
  • To assess the safety profile of using ECs for smoking cessation purposes.

Main Methods:

  • Systematic review including randomized controlled trials (RCTs) and randomized cross-over trials.
  • Searched multiple databases (Cochrane, MEDLINE, Embase, PsycINFO) up to January 2020.
  • Primary outcomes: smoking abstinence (≥6 months), adverse events (AEs), and serious adverse events (SAEs).

Main Results:

  • Moderate-certainty evidence shows nicotine ECs increase quit rates compared to nicotine replacement therapy (NRT) (RR 1.69) and non-nicotine ECs (RR 1.71).
  • Nicotine ECs may increase quit rates compared to no support (RR 2.50), though with very low certainty.
  • No clear evidence of harm detected; common AEs (throat irritation, headache) tend to dissipate. SAEs were rare.

Conclusions:

  • Nicotine ECs demonstrate moderate-certainty effectiveness in increasing smoking cessation rates compared to NRT and non-nicotine ECs.
  • Evidence suggests potential benefit over no support, but certainty is lower.
  • Further research on modern EC products is needed; safety data is limited by imprecision and short follow-up.