Nicotine Replacement Therapy Guide: Patches, Gum, Lozenges, and More

Nicotine replacement therapy (NRT) raises your chances of quitting smoking. The Cochrane review of 133 trials found that every form of NRT raised quit rates by about 50–60% compared with placebo or no NRT (RR 1.55), and called further research "very unlikely to change our confidence". The NHS puts it more simply: NRTs can double your chances of quitting for good.

This guide covers how NRT works, which product to choose, and how to use it well. A pharmacist can help you pick — and should, if you are pregnant or have a heart condition.

How NRT Works

NRT separates the nicotine from the smoke. It gives your body nicotine without the tar, carbon monoxide and other chemicals in cigarettes, so you can deal with the habit while the withdrawal is softened. The NHS says nicotine on its own doesn't cause cancer, lung disease, heart disease or stroke; the other chemicals in cigarettes do most of the damage.

NRT products are absorbed more slowly than cigarette smoke, which the standard pharmacology review says gives them a low potential for abuse — only nasal spray comes close to a cigarette's speed.

The Products: Pros, Cons, and Use Cases

Nicotine Patches

How they work: Patches release nicotine through the skin steadily over 16 or 24 hours. The NHS says a 24-hour patch helps with cravings when you wake up; a 16-hour patch is for while you're awake.

Strength: Patches come in several strengths. The NHS says heavier smokers should start with a higher strength, and in the Cochrane review 21 mg patches beat 14 mg, while 42/44 mg did no better than 21/22 mg.

Best for: Steady background cover without having to remember to use something repeatedly.

Limitations: Slow to act, so a patch alone doesn't handle sudden cravings well, and it does nothing for the hand-to-mouth habit. Some people get skin irritation — change the site each day — or disturbed sleep with a 24-hour patch; ask your pharmacist about taking it off at bedtime or using a 16-hour patch.

Nicotine Gum

How it works: Nicotine is absorbed through the lining of the mouth, not swallowed. The NHS describes it: chew the gum, then rest it inside your cheek — the "chew and park" method. Chewing it like ordinary gum means more nicotine is swallowed, which wastes it and can upset your stomach.

Strength: Usually 2 mg and 4 mg. In the Cochrane review, 4 mg gum worked better than 2 mg, mainly for highly dependent smokers.

Best for: Situational cravings; people who want something to do with their mouth.

Limitations: You have to remember to use it. Pack instructions usually advise avoiding acidic drinks such as coffee or fizzy drinks just before and during use, because NRT products are designed to be absorbed at an alkaline pH.

Nicotine Lozenges and Microtabs

How they work: Like gum without the chewing: suck a lozenge, then rest it in your cheek; a microtab dissolves under your tongue.

Best for: People who find gum awkward or have dental work; situations needing discretion.

Nicotine Inhalator

How it works: A cartridge in a plastic mouthpiece. The nicotine is absorbed in the mouth and throat, not the lungs.

Best for: People for whom the hand-to-mouth ritual is a big part of the habit — the NHS says it mimics the "hand-to-mouth" habit of smoking.

Nicotine Mouth Spray and Nasal Spray

How they work: Very fast-acting. The NHS says the nasal spray is the fastest way nicotine can enter the bloodstream; the pharmacology review notes it is the only NRT with a delivery speed close to smoking.

Best for: Strong, sudden cravings.

Limitations: Nasal spray commonly irritates the nose at first.

Combination NRT: The Underused Strategy

Combination NRT — a patch for steady background nicotine plus a fast-acting product for cravings — is what the NHS recommends: combine a slow-acting and a fast-acting product.

The Cochrane review found high-certainty evidence that combination NRT gives higher long-term quit rates than a single form (RR 1.25). It also found using a fast-acting form alone works about as well as a patch alone — so the gain comes from combining them.

Dosage and Duration

Use enough. Heavier smokers generally need the higher strengths — the NHS says to start with a higher-strength patch if you're a heavier smoker. A pharmacist can check your dose against how much you smoked.

Use it for long enough. The NHS says NRT is recommended for about 12 weeks, or for as long as it's needed to stop you smoking again, and that many people don't use products for long enough, which can cause cravings to return. The Cochrane review found no clear evidence either way on the length of patch courses, so follow the pack or your adviser.

Step down. Most patch packs set out a step-down schedule from high to low strength; follow the one on your product or from your pharmacist.

Start before quit day? In the Cochrane review, using NRT for a while before quit day may improve quit rates (RR 1.25) — ask your pharmacist whether your product allows it.

NRT vs. Prescription Medications

In the Cochrane reviews, varenicline beat a single form of NRT (RR 1.25) but showed no clear difference against combination NRT, and bupropion worked about as well as single-form NRT. So combination NRT is among the most effective options there are, and needs no prescription. If you have tried NRT before without success, or want to combine approaches, see prescription medications to quit smoking and talk to your GP — the NHS says combining a nicotine-free medicine with NRT gives the best chance.

Is NRT Safe?

For the vast majority of people, yes. NRT gives nicotine without tobacco smoke, and is far safer than continuing to smoke.

Heart conditions: The pharmacology review notes that clinical trials of nicotine patches in smokers with cardiovascular disease showed no increased risk of cardiovascular events compared with placebo. If you have had a recent heart attack or stroke, have unstable or worsening angina, or a serious heart-rhythm problem, talk to your doctor before starting.

Pregnancy and breastfeeding: The NHS says NRTs are licensed and safe to use in pregnancy, and are the recommended option for pregnant smokers who need support — but speak to your midwife, doctor or pharmacist first to choose the right product, and avoid liquorice-flavoured nicotine products in pregnancy.

Other medicines: Stopping smoking can change how fast your body clears some medicines, such as clozapine, olanzapine and theophylline, so doses may need adjusting. Tell your doctor or pharmacist you're quitting.

FAQ

Why do I still crave cigarettes on the patch?

Because a patch releases nicotine slowly and steadily: it takes the edge off withdrawal but cannot match the quick hit of a cigarette, and it does nothing for the habit side, such as the hand-to-mouth routine. That is why the NHS recommends adding a fast-acting product, such as gum, a lozenge or a mouth spray, for sudden cravings; in the Cochrane review, combining the two gave higher long-term quit rates. A pharmacist can check your patch strength.

How long should I use nicotine replacement therapy?

The NHS recommends about 12 weeks, or longer if you need it to stay stopped — stopping too early is a common reason cravings come back. Follow the step-down plan on the pack or from your adviser.

Can I use NRT if I'm still smoking?

Some NRT products are licensed to help you cut down before you quit; check the pack or ask a pharmacist. The pharmacology review notes that adding nicotine medication on top of smoking produced no further rise in heart rate, because nicotine's effects level off at smoking doses.

Can you get addicted to NRT?

It is possible but uncommon: NRT delivers nicotine more slowly and at lower peaks than cigarettes, which gives it a low abuse potential. Some people keep using it longer than planned. That is far safer than going back to smoking, and a pharmacist can help you taper off.