A Pragmatic Randomized Comparative Trial of e-Cigarettes and Other Nicotine Products for Quitting or Long-Term Substitution in Smokers

Abstract

Introduction

Tobacco harm reduction has potential to improve individual and population health. However, little research exists on low-intensity interventions, such as encouraging longer-term NRT or e-cigarette use. We aimed to determine whether: (1) encouraging use of nicotine products as long-term tobacco substitutes is more effective for smoking abstinence than standard treatment, and (2) offering e-cigarettes is more effective than NRT.

Methods

An open-label, parallel-group randomized trial was conducted in Australia between 2014 and 2015, with 1563 adult daily smokers, randomized to: (A) standard cessation advice and NRT: advice to use NRT short-term, (B) quit or substitute advice and NRT: advice to use NRT as a longer-term substitute for smoking if required to maintain smoking cessation, or (C) Quit or substitute advice and NRT and/or e-cigarettes. Participants were offered an initial supply of products they could then purchase for up to 7 months. The primary outcome was self-reported continuous smoking abstinence at 7 months. Point prevalence, dual use, and cigarette reduction were secondary outcomes.

Results

At 7 months, 2.8% (N = 9) of group A (N = 324) were abstinent, compared with 1.8% (N = 11) in B (N = 620) and 1.3% (N = 8) in C (N = 619) (adjusted odds ratio [ORs]: B vs. A 0.66, 95% confidence interval [CI]: 0.27−1.63; C vs. A 0.46, 95% CI: 0.17−1.21; C vs. B 0.69, 95% CI 0.27–1.73). There were no suspected unexpected serious adverse reactions associated with trial products.

Conclusion

A free trial of NRT and first generation e-cigarettes and advice on long-term substitution was no better for smoking abstinence than usual care.

Clinical Trial Registration

The trial was registered with the Australian Therapeutic Goods Administration under their Clinical Trials Notification scheme and the Australian and New Zealand Clinical Trials Registry (ACTRN12612001210864).

Implications

This pragmatic trial allowed the comparison of existing and alternative policy options under semi-realistic conditions, such as product choice and financial cost. All trial arms had low rates of smoking cessation. The findings suggest that providing unflavored cigalike e-cigarettes without additional support may not increase quitting compared with advice to use standard NRT in a general population of Australians who smoke. More intensive support and education, and/or opportunity to try a range of e-cigarette products, may be required to motivate quit attempts using e-cigarettes.