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Nicotine replacement therapy versus control for smoking cessation.

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Nicotine replacement therapy (NRT) significantly increases smoking cessation success rates by 50-60% across all licensed forms. This high-quality evidence supports NRT as an effective tool for quitting smoking, independent of additional support.

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Area of Science:

  • Public Health
  • Pharmacology
  • Addiction Medicine

Background:

  • Nicotine replacement therapy (NRT) is designed to mitigate nicotine cravings and withdrawal symptoms, aiding smokers in their transition to complete abstinence.
  • The motivation behind NRT is to reduce the dependence on combustible cigarettes by providing a controlled nicotine dose.

Purpose of the Study:

  • To evaluate the efficacy and safety of various forms of nicotine replacement therapy (NRT) for long-term smoking cessation.
  • To compare the effectiveness of NRT (gum, patch, spray, inhaler, oral preparations) against placebo or no intervention.

Main Methods:

  • A systematic search of the Cochrane Tobacco Addiction Group trials register identified relevant randomized trials.
  • Studies included participants motivated to quit, comparing NRT to placebo or no treatment, with a minimum follow-up of six months.
  • Data extraction, risk of bias assessment, and meta-analysis using a fixed-effect model were employed to determine the risk ratio (RR) for abstinence.

Main Results:

  • 133 trials involving 64,640 participants demonstrated that any form of NRT increased the odds of abstinence by 55% (RR 1.55, 95% CI 1.49 to 1.61).
  • Specific NRT forms showed varying effectiveness: nicotine nasal spray (RR 2.02) and inhalator (RR 1.90) were most effective, followed by the patch (RR 1.64) and gum (RR 1.49).
  • Adverse events were product-specific (e.g., skin irritation, oral irritation); chest pain and palpitations were rare and not significantly more frequent with NRT.

Conclusions:

  • High-quality evidence confirms that all licensed NRT forms significantly enhance smoking cessation success rates by 50-60%.
  • The effectiveness of NRT is largely independent of the intensity of additional support provided.
  • While minor local irritations are common, serious adverse events are rare, supporting NRT's safety profile for smoking cessation.