Stop Smoking Aids: What the Evidence Shows

What quitting actually involves

Stopping smoking is not one decision. It is a set of physical changes that happen over days and weeks, plus a set of habits that run on their own for much longer. The physical part is nicotine withdrawal, and it has a shape. It peaks in the first few days, is usually worst in the first week, and settles over roughly two to four weeks. Sleep is often disturbed for longer. Concentration and low mood can take several weeks to normalise. That timeline comes from the clinical literature summarised by the UK National Institute for Health and Care Excellence (NICE) and the US Surgeon General’s reports on smoking cessation.

On day three, the withdrawal is near its peak. That is not failure and it is not a sign that this attempt is different from the last one. It is the expected course.

What follows is a comparison of the aids people search for, with the evidence attached to each. Where the trial evidence is strong, that is stated. Where it is weak, that is stated too.

Nicotine replacement therapy (NRT)

NRT delivers nicotine without the smoke. It comes as patches, gum, lozenges, inhalators, nasal spray and mouth spray. Patches give a steady background dose; the fast-acting forms give a top-up for cravings.

A Cochrane review of nicotine replacement therapy, updated in 2018, found that any form of NRT increases the chance of quitting compared with placebo or no aid. The same review found that combining a patch with a fast-acting form works better than a single form. That combination finding is one of the more consistent results in this field.

NRT is available over the counter in many countries and on prescription in others. Side effects are usually local: skin irritation from patches, hiccups or jaw ache from gum, throat irritation from sprays. The reader and a pharmacist or doctor decide whether it is suitable, particularly in pregnancy or with heart conditions.

Varenicline, bupropion and cytisine

Varenicline is a prescription tablet. It partially stimulates the same nicotine receptors and blocks nicotine from binding, which reduces craving and the reward from a cigarette. Trials, including those pooled in Cochrane reviews, found varenicline more effective than placebo and generally more effective than a single form of NRT. Common side effects include nausea, vivid dreams and insomnia. In 2021 the US Food and Drug Administration removed a boxed warning about serious neuropsychiatric events after a large trial did not find that risk. Whether it is appropriate, and whether it is prescribed, is a decision for the reader and their doctor.

Bupropion is an antidepressant also licensed as a stop-smoking aid in some countries. Cochrane reviews found it more effective than placebo, with roughly similar effectiveness to single-form NRT. It is not suitable for everyone, including people with a history of seizures or certain eating disorders. Again, that is a conversation with a doctor, not a decision this page can make.

Cytisine is a plant-derived partial nicotinic agonist used as a stop-smoking aid in parts of central and eastern Europe and available in some other countries. Cochrane reviews have found it more effective than placebo, with effectiveness in the same broad range as varenicline. It is not licensed everywhere.

None of these is a cure. They change the odds. Some people take them and still smoke.

Behavioural support, apps and national programmes

Behavioural support means structured help from a trained person: one-to-one sessions, group programmes, or telephone quitlines. Cochrane reviews of behavioural interventions found that they increase quitting rates, and that combining them with medication works better than either alone.

Apps are widely used and much less studied. Some trials of smartphone apps for smoking cessation have found small benefits; others have found none. The evidence base is thinner than for face-to-face or telephone support.

What many people do not know is that free national stop-smoking services exist in many countries. In England, the NHS Stop Smoking Services offer behavioural support and can supply NRT or arrange prescriptions at no cost to the user. In the US, 1-800-QUIT-NOW connects callers to state quitlines, and many state programmes provide free patches or gum. Similar services exist in Canada, Australia and across Europe. These are typically free, and they are underused.

The Allen Carr method and stop smoking books

Allen Carr’s The Easy Way to Stop Smoking is one of the best-known stop smoking books, and searches for it are common. The method combines reading with a reframing of how the reader thinks about cigarettes: the argument is that smoking provides no real pleasure or support, and that the fear of stopping is what makes it hard.

There is very little controlled trial evidence on the Allen Carr method specifically. A small randomised trial published in 2006 in the journal Addiction compared a Allen Carr-based intervention with a GP brief intervention and found no significant difference in quit rates at 12 months. That is one small trial, not a verdict, but it is the main piece of trial evidence available, and it does not show the method outperforming ordinary advice.

Many people report that the book helped them. That is real, and it is also not the same as trial evidence. The book is inexpensive and low-risk. It is one option among several.

Hypnosis and hypnotherapy

Hypnosis is used as a stop-smoking aid, and it is the subject of a Cochrane review. That review found no clear evidence that hypnotherapy performs better than other interventions, including brief advice, for smoking cessation. The trials were few, small and varied in quality, so the finding is best read as “not demonstrated” rather than “shown not to work.” That is the honest state of the evidence.

Where nicotine replacement and prescription medication have stronger trial support, that should be said plainly: the evidence for combination NRT and for varenicline is stronger than the evidence for hypnosis. This page is published by the makers of Liberto, a hypnosis app, and that is a conflict of interest. The reason it is stated here, in this section, is that a reader who finds it buried elsewhere would be right to distrust everything above it.

Cold turkey and unaided quitting

Most people who stop smoking do it without any aid. That is a fact about populations, not a recommendation. Unassisted quitting has lower success rates per attempt than aided quitting in most trials, but it is also the most common route, and many people succeed on a later attempt after earlier ones did not hold.

There is no reliable way to predict which attempt will be the one that lasts. What the evidence does suggest is that repeated attempts increase the cumulative chance of stopping, and that using an aid with trial support improves the odds of any given attempt.

Comparing the options

The table below sets out the main aids, the strength of the trial evidence behind each, and the practical notes. It is a summary of the sections above, not a ranking.

What this means for a decision

No aid on this page is a cure and none guarantees anything. The aids with the strongest trial support are combination NRT and varenicline. Behavioural support adds to either. Free national programmes exist and most people do not use them. Hypnosis and the Allen Carr method have weaker evidence, which does not mean they cannot help, only that the trials have not shown they do better than alternatives.

The decision about which to use, and whether to involve a doctor, belongs to the reader. On day three, at 11pm, the useful question is not which method is best in general but which one is available tonight and can be started tomorrow.