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Electronic cigarettes (ECs) show promise in helping smokers quit and reduce cigarette consumption compared to placebo devices. However, the evidence quality is low, necessitating further research on their long-term efficacy and safety.

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Area of Science:

  • Public Health
  • Addiction Medicine
  • Respiratory Medicine

Background:

  • Electronic cigarettes (ECs) are increasingly used by smokers seeking to reduce smoking-related harms.
  • Healthcare providers require evidence on EC efficacy and safety to advise patients.
  • Existing evidence on ECs for smoking cessation and harm reduction is limited.

Purpose of the Study:

  • To evaluate the efficacy of ECs in achieving long-term smoking abstinence.
  • To assess EC effectiveness in reducing cigarette consumption by at least 50%.
  • To determine the occurrence of adverse events associated with EC use.

Main Methods:

  • Systematic review of randomized controlled trials (RCTs) and cohort studies up to July 2014.
  • Inclusion criteria: current smokers randomized to ECs or control, with at least six months follow-up for abstinence/reduction.
  • Data extraction and meta-analysis using fixed-effect Mantel-Haenszel models to calculate risk ratios (RR) and 95% confidence intervals (CI).

Main Results:

  • Two RCTs (n=662) indicated ECs increased long-term smoking abstinence compared to placebo ECs (RR 2.29, 95% CI 1.05-4.96; GRADE: low).
  • ECs were associated with greater reduction in cigarette consumption versus placebo (RR 1.31, 95% CI 1.02-1.68) and nicotine patches (RR 1.41, 95% CI 1.20-1.67).
  • No serious adverse events plausibly related to EC use were reported; overall adverse event proportions were similar across groups.

Conclusions:

  • Evidence suggests ECs aid long-term smoking cessation versus placebo, but confidence is low due to limited trials and imprecision.
  • ECs appear effective in reducing cigarette consumption compared to placebo and nicotine patches, though evidence certainty is affected by limitations.
  • Short-term EC use has not shown evidence of associated health risks.