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Home NEWS Science News

Nicotine e-cigarettes, prescription drugs and dual nicotine replacement therapy identified as most effective stop-smoking aids

Bioengineer by Bioengineer
September 12, 2023
in Science News
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Nicotine e-cigarettes and two prescription medications that curb symptoms of withdrawal are the most effective stop-smoking aids, according to a comprehensive, multinational review by a team of scientists, including a University of Massachusetts Amherst public health and health policy researcher.

Senior author

Credit: UMass Amherst

Nicotine e-cigarettes and two prescription medications that curb symptoms of withdrawal are the most effective stop-smoking aids, according to a comprehensive, multinational review by a team of scientists, including a University of Massachusetts Amherst public health and health policy researcher.

Dual forms of nicotine replacement therapy (NRT), such as combining a patch with gum or a lozenge, were found to be nearly as effective. 

Smoking remains the leading cause of preventable disease and death worldwide, and many people who want to quit smoking find it very difficult, due to the addictive nature of nicotine. The new study’s findings offer strong evidence to help reshape public health policies and strategies, offering smokers more effective tools to quit for good.

“The best thing someone who smokes can do for their health is to quit smoking,” says Jamie Hartmann-Boyce, assistant professor of health policy and management in the School of Public Health and Health Sciences. “Our findings provide clear evidence of the effectiveness of nicotine e-cigarettes and combination nicotine replacement therapies to help people quit smoking. The evidence also is clear on the benefits of medicines cytisine and varenicline, but these may be harder for some people to access at the moment.”

Hartmann-Boyce is senior author of the paper published Tuesday, Sept. 12, in the Cochrane Database of Systematic Reviews. She conducted the research at the University of Oxford, England, where she then worked as an associate professor and director of the Evidence-based Healthcare Ph.D. Program at Oxford’s Nuffield Department of Primary Care Health Sciences. The team also included colleagues at the University of Leicester in the UK.

Nicola Lindson, lead author and a senior researcher at Oxford’s Nuffield Department of Primary Care Health Sciences, notes that the team compared the results for different stop-smoking aids that have been used in over 300 clinical trials involving more than 150,000 people. 

“Our research dives deep into the world of smoking cessation,” she says. “By pulling together this data, we can see that when people use the medicines licensed for quitting smoking or nicotine e-cigarettes, they are more likely to quit than if they do not use these aids.”

The analysis found that around 14 of 100 people trying to quit smoking are likely to succeed using a nicotine e-cigarette, varenicline or cytisine, in any given attempt to quit. For those using two forms of NRT, about 12 of 100 will likely quit smoking, defined as no smoking for at least six months. The success rate drops to around nine in 100 for those using only one form of NRT, such as a patch or gum. 

Those rates compare to the finding that around six in 100 people will be successful at quitting smoking without any aids. Stop-smoking aids work better when people also receive behavioral support to quit. Serious side effects were rare for all the stop-smoking options, the study also found.

Hartmann-Boyce points out that the long-term effects of using nicotine e-cigarettes are not known, but she emphasizes that the studies the team reviewed were testing regulated nicotine-containing e-cigarettes without additional additives known to cause harm. This review focused exclusively on evaluating the effects of a range of smoking cessation methods and did not set out to investigate broader aspects of the public health discourse regarding e-cigarettes, including their use among nonsmokers and young people.

“Nicotine itself is not the thing that causes the many diseases we associate with smoking,” Hartmann-Boyce says. “Broad scientific consensus is that regulated nicotine e-cigarettes are highly, highly likely to be much less harmful than conventional cigarettes, but not harmless.” 

Both varenicline, a World Health Organization essential medicine, and cytisine help reduce the symptoms of withdrawal. The brand-name form of varenicline – Champix – is not available in the U.S. and other parts of the world due to a manufacturing problem, though generic forms of varenicline have been approved by the FDA. Cytisine is not currently licensed or marketed in the U.S. and most other countries outside of Central and Eastern Europe. 



Journal

Cochrane Database of Systematic Reviews

DOI

10.1002/14651858.CD015226.pub2

Method of Research

Data/statistical analysis

Subject of Research

People

Article Title

Pharmacological and electronic cigarette interventions for smoking cessation in adults: component network meta-analyses

Article Publication Date

12-Sep-2023

COI Statement

JHB is an editor for the Cochrane Tobacco Addiction Group; however, she was not involved in
the editorial process for this review. JHB has written pieces for The Conversation and been
interviewed by the media on the findings of Cochrane Reviews assessing the effects of
treatments for smoking cessation. These outputs were evidence-based and not based on
personal opinion. JHB receives funding for two research grants on the topic of e-cigarettes
from Cancer Research UK, who have interests in people stopping smoking and run educational
campaigns on the topic; paid to University of Oxford.

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