Tips for Stopping Smoking: What the Evidence Shows

What the first week is actually like

Nicotine leaves the body quickly. The half-life of nicotine in the bloodstream is about two hours, which is why the first days are the sharpest. According to the CDC, nicotine withdrawal peaks within the first three days and then fades over two to four weeks. The symptoms are specific: irritability, restlessness, difficulty concentrating, increased appetite, and disturbed sleep. They are not a sign that something is wrong. They are the measurable result of nicotine receptors in the brain adjusting to the absence of a drug they had adapted to.

The craving itself is short. Research reviewed by the American Cancer Society describes cravings as typically lasting three to five minutes. That number matters because it changes what a person is being asked to do. Not to resist forever. To get through the next few minutes. A craving is a wave, not a wall.

Day three is often the worst. By then nicotine is largely gone, and the receptors are still expecting it. The irritability is not a character flaw. It is a neurological event with a timescale, and the timescale is days, not months.

Tips that have evidence behind them

Delay. The four-minute craving means the task is small. Wait it out. The urge will pass whether or not anything is done about it.

Change the route. Smoking is tied to places and times. Walking a different way to the shop, or sitting in a different chair, breaks the association between a location and a cigarette. This is not a trick. It is removing a cue that has been paired with nicotine hundreds of times.

The first coffee. Many people find the morning coffee is the hardest cigarette to lose because the two have been paired for years. Switching to tea for a week, or drinking the coffee standing up instead of sitting down, changes the cue. The evidence for cue disruption is behavioural, not pharmacological, but it is consistent.

Alcohol. Drinking lowers inhibition and is one of the most commonly reported causes of a return to smoking. The NHS advises avoiding alcohol in the early days, or drinking in situations where smoking is less likely. This is not moral advice. It is about not stacking a disinhibiting drug on top of a withdrawal state.

The first weekend. Weekends remove the structure that work provides. The NHS recommends planning the weekend in advance: what will be done at the times when cigarettes were usually smoked. An empty Saturday is a cue-rich environment.

Nicotine replacement therapy (NRT). A Cochrane review found that NRT increases the chances of stopping compared with placebo or no treatment. It works by giving the body nicotine without the tar and carbon monoxide of smoke, which reduces withdrawal. It is available as patches, gum, lozenges, sprays and inhalators. The evidence supports using it, and combining a patch with a fast-acting form is supported by the same review.

Prescription medicines. Varenicline and bupropion are prescription medicines. A Cochrane review found that varenicline has the strongest trial evidence of the medicines studied for helping people stop. Whether either suits a particular person is a question for their doctor, not for a website.

Behavioural support. The NHS Stop Smoking Services combine medication with weekly behavioural support. The Cochrane review of behavioural interventions found that support increases the chances of stopping compared with willpower alone. The combination of medication and support has better evidence than either alone.

Tips that have no evidence behind them

Some popular advice has no trial support. It is not harmful, but it should not be relied on.

Hypnosis. A Cochrane review of hypnotherapy for smoking cessation found no clear evidence that hypnotherapy performs better than other interventions, or better than no treatment. That is the finding. It does not say hypnosis is useless. It says the trials have not shown it to be better than what it was compared with.

Acupuncture. Cochrane reviews of acupuncture for smoking cessation have found no consistent evidence that it helps people stop.

Laser therapy. There is no good evidence that laser therapy helps people stop smoking.

Willpower alone. Not a tip, but a common assumption. The evidence shows that unaided quitting has the lowest success rate of the methods studied. This is not a criticism of anyone who tries it. It is information about what the trials measured.

Cutting down gradually. Some people do stop this way. The evidence for gradual reduction is weaker than for setting a quit date and stopping on it. If cutting down is the only option someone will accept, it is better than nothing, but it is not the method with the most trial evidence behind it.

How to give up nicotine, not just cigarettes

Nicotine is the drug that withdrawal is about. Giving up cigarettes but using NRT still gives the body nicotine, which is the point: it separates the drug from the smoke. The NHS recommends using NRT for around eight to twelve weeks, then reducing. The evidence for tapering is that it reduces withdrawal symptoms while the behavioural patterns are being broken.

Some people use vapes to stop smoking. A Cochrane review found that nicotine e-cigarettes may help people stop smoking compared with NRT, but the evidence is moderate, not certain. Vapes are not harmless, and they are not a licensed medicine. The NHS position is that they are less harmful than smoking but not risk-free, and that they are not recommended for people who have never smoked.

Stopping while pregnant

Pregnant women are often given different advice because the risks of smoking in pregnancy are specific and well documented. The NHS recommends that pregnant women who smoke should be referred to a stop smoking service and offered support. NRT is sometimes prescribed in pregnancy, but the decision is made by a doctor or midwife. Varenicline and bupropion are not usually recommended in pregnancy. The evidence on hypnosis in pregnancy is not strong enough to recommend it as a replacement for support and, where appropriate, NRT.

Weight gain

The average weight gain after stopping smoking is around 4 to 5 kg over the first year, according to the NHS. It is caused by several things: nicotine increases metabolic rate slightly, it suppresses appetite, and food tastes better when the sense of smell returns. The weight gain is real and it is not a reason to keep smoking. The NHS advises that the health benefits of stopping outweigh the weight gain, and that the gain can be managed with diet and exercise. NRT, particularly gum, may delay weight gain while it is being used. Whether to use NRT for that reason is a question for a pharmacist or doctor.

What the trials measured

The table below compares methods by the strength of trial evidence, not by how they feel.

If this is day three

The irritability is the withdrawal. It peaks around now and fades over the next two to four weeks. The cravings last minutes, not hours. The first coffee, the first drink, and the first weekend are the cues that will be hardest, and they can be changed. NRT and prescription medicines have trial evidence behind them. Hypnosis does not have clear evidence that it beats other methods. Whether to use any of them is a decision for the person stopping and, for medicines, their doctor. Nothing here is a cure and nothing here is guaranteed. What is known is that the withdrawal ends, and that the methods with the most evidence behind them are available.