Electronic cigarettes have not been subjected to the same type of efficacy testing as nicotine replacement products. The evidence suggests that e cigarettes can supply nicotine at concentrations that are enough to substitute for traditional cigarettes. [ A meta-analysis that pooled the results of two randomized controlled trials (RCTs), covering 662 participants, showed that smokers who used nicotine electronic cigarettes (ECs) were significantly more likely to stop smoking than smokers using placebo ECs. A third RCT in 2014 found that in smokers who were "not interested" in quitting, after eight weeks of e cigarette use 34% of those who used e cigarettes had quit smoking in comparison with 0% of users who did not use e cigarettes, with considerable reductions in smoking found in the e cigarette group. An exhaustive study review, found no evidence that using electronic cigarettes at the same time as using regular cigarettes made people less likely to quit smoking.
A 2014 UK cross-sectional population survey of smokers who tried to stop without professional assistance, found that those who used e cigarettes were more likely to stop smoking than those who used nicotine replacement products. While there are some reports of improved smoking cessation, especially with intensive e cigarette users, there are also several studies showing a decline in cessation in dual users. TheUS Preventive Services Task Force found there is not enough evidence to recommend e cigarettes for quitting smoking in adults. In terms of reduction in cigarette consumption, nicotine-containing ECs were significantly more effective than placebo ECs and also significantly more effective than nicotine patches in helping people achieve 50% or greater reduction in smoking. A 2015 review found that vaping was not associated with successful quitting, but there are reports of quitting smoking or reduction. e public health result.
A 2015 review found that e cigarette users had 20% higher cessation rates than users of nicotine replacement products, which suggested that factors other than nicotine replacement products may contribute to quitting smoking. A 2014 review found limited evidence that e cigarettes do not seem to improve cessation rates compared to regulated FDA nicotine replacement products. Two 2014 reviews found no evidence that e cigarettes are more effective than existing nicotine replacement products for smoking cessation. A 2014 review found they may be as effective, but not more, compared to nicotine patches for short-term smoking cessation. use at 6 months while 8% for patch users, indicating that vaping may continue after other quit methods A 2014 review found that e cigarettes have not been proven to be better than regulated medication for smoking cessation. A 2014 review found four experimental studies and six cohort studies that indicated that electronic cigarettes reduced the desire to smoke and withdrawal symptoms. This review also noted that two cohort studies found that electronic cigarettes led to a reduction in the number of cigarettes smoked per day. Nicotine-containing e cigarettes were associated with greater effectiveness for quitting smoking than e cigarettes without nicotine. A 2014 review concluded that the adverse public health effects resulting from the widespread use of e cigarettes could be significant, in part due to the possibility that they could undermine smoking cessation. This review therefore stated for their use to be limited to smokers who are unwilling or unable to quit. A 2014 review found that personal e cigarette use may reduce overall health risk in comparison to traditional cigarettes. However, e cigarettes could have a broad adverse effect for a population by expanding initiation and lowering cessation of smoking. Any residual risk of vaping should be weighed against the risk of continuing or returning to smoking, taking account of the low success rate of currently-approved smoking cessation medications.