Compared with using no help, the odds of abstinence were increased by daily use of disposable/cartridge ECs (OR=3.31 (1.32, 8.26), p=.010) and daily use of refill/modular ECs (OR=5.47 (2.70, 11.11), p<.001). Odds were reduced by non‐daily use of disposable/cartridge ECs (OR=0.23 (0.08‐0.63), p=.005), and by use of disposable/cartridge ECs to quit and no longer using at follow‐up (OR=0.10 (0.16‐0.62), p<.013). Secondary Results were similar to the primary outcome; however, odds of abstinence were also increased by use of smoking cessation medication (OR=4.15 (1.79, 9.62), p=.001).
Dr Máirtín McDermott, Research Fellow at King's College London's National Addiction Centre and lead author of the study, said: "Our results show that when used daily, e-cigarettes help people to quit smoking, compared to no help at all. These findings are in line with previous research, showing that e-cigarettes are a more effective aid for quitting than nicotine replacement therapy and prescribed medication."It's important that we routinely measure how often people use e-cigarettes, as we've seen that more sporadic use at follow up -- specifically of refillable types -- was not associated with abstinence."
Dr Leonie Brose, Reader at King's College London's national Addiction Centre added: "Despite the World Health Organization's (WHO) cautious stance on e-cigarettes, studies like ours show they are still one of the most effective quitting aids available.
"The WHO is especially concerned about refillable e-cigarettes, as these could allow the user to add harmful substances or higher levels of nicotine. However, we've shown that refillable types in particular are a very effective quitting aid when used daily, and this evidence should be factored into any future guidance around their use."
UK study shows nondaily ecig use associated with significantly less quitting cigs https://t.co/bjkhexr1qJ
— Stanton Glantz (@ProfGlantz) March 17, 2021
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