Cardio won't get you off cigarettes, but quitters who train get fitter

Smokers reach for a range of quitting strategies, including switching to electronic cigarettes, and exercise is often suggested as an easy and cheap alternative aid. The appeal is obvious: it costs nothing, it is accessible, and it could rebuild fitness at the same time as supporting the quit. Yet surprisingly little has been established about whether aerobic exercise actually improves the odds of staying off cigarettes in the long run. This review set out to gather the randomised trial evidence on aerobic exercise for both smoking and vaping cessation and weigh it as a whole.

The researchers systematically searched multiple databases for randomised controlled trials of aerobic exercise as an aid to quitting smoking or vaping. The outcomes of interest were long-term cessation and maximal or peak oxygen uptake, a standard measure of aerobic fitness, measured after quitting. Thirteen trials met the criteria, and each was graded with a standard risk of bias tool: five were rated high quality, two moderate and six low. The results were then pooled to estimate the overall effect of aerobic exercise on long-term quit success and on fitness.

When the trials were pooled, aerobic exercise did not significantly increase the number of long-term successful quitters. Two of the high quality trials stood apart: programmes of three vigorous supervised sessions a week, run for 12 to 15 weeks, did increase long-term quitters. Fitness told a more positive story, with VO2max or VO2peak improving by the end of treatment. And strikingly, the search turned up no trials at all testing aerobic exercise as an aid to quitting vaping.

Exercise is widely promoted as a quit-smoking aid, and individual positive trials are often cited in its favour. This pooled analysis complicates that picture: taken together, the evidence does not support a long-term cessation benefit, even though the strongest programmes hinted at one. That leaves open the question of dose, since the two encouraging trials used vigorous, supervised, multi-week programmes rather than casual activity. The complete absence of vaping trials is itself a finding, given how many people vape and want to stop.

If you are trying to quit smoking, this is a reason not to rely on exercise alone to carry the attempt. It is equally a reason not to abandon training: quitters who exercised got measurably fitter, and the most structured vigorous programmes were the ones linked to more successful quitters in individual trials. For vapers hoping exercise will help them stop, the honest answer is that nobody has tested it yet.