Nicotine replacement therapy (patch, gum, lozenge, inhaler, spray)

What it treats

Nicotine replacement is approved by the U.S. Food and Drug Administration as an aid to smoking cessation. The patch, gum, and lozenge are available over the counter. The inhaler and nasal spray require a prescription.

Guidelines from the U.S. Preventive Services Task Force and the American Thoracic Society list NRT alongside varenicline as a first-line option. Combining NRT with counseling roughly doubles quit rates compared to counseling alone.

How it works

The reason cigarettes are addictive is that inhaled nicotine hits the brain within about 10 seconds, delivering a sharp dopamine spike that reinforces the behavior. NRT delivers nicotine much more slowly. The patch delivers a steady, low, continuous level across 16 or 24 hours. The gum and lozenge peak in about 20 to 30 minutes. The inhaler and nasal spray are faster than gum but still slower and lower than a cigarette. That slower delivery reduces the reinforcing pattern, which is what starts to break the loop.

At the receptor level, NRT stimulates the same nicotinic acetylcholine receptors that cigarettes do, but the dose profile is gentler. Withdrawal symptoms (irritability, cravings, difficulty concentrating, low mood) settle. The urge to smoke drops enough that behavioral strategies actually have room to work.

Receptor mechanism (detail)

Nicotine binds nicotinic acetylcholine receptors throughout the brain, most importantly the α4β2 subtype in the ventral tegmental area and nucleus accumbens, which drives dopamine release and reward. NRT delivers the same molecule but at slower rates and lower peak levels than smoking, so the receptors are occupied enough to reduce withdrawal and craving without the reinforcing spike.

Potency and typical dosing pattern

Ranges are typical framework only, not a prescription for any individual.

Patch. 21 mg per 24 hours if you smoke more than 10 cigarettes a day. 14 mg if you smoke 10 or fewer. Step down every 2 to 4 weeks (21 mg to 14 mg to 7 mg), typically over 8 to 12 weeks. There's also a 16-hour patch (Nicotrol) worn during the day.

Gum. 2 mg for people who smoke their first cigarette more than 30 minutes after waking. 4 mg if within 30 minutes. Chew one piece every 1 to 2 hours for the first 6 weeks, then taper. Chew until you feel a tingle or peppery taste, then park it between cheek and gum. Not like regular chewing gum.

Lozenge. 2 mg or 4 mg dosed the same way as gum. Let it dissolve slowly (20 to 30 minutes). Don't chew or swallow it.

Inhaler. Puff on the cartridge as needed, up to 6 to 16 cartridges per day.

Nasal spray. One spray in each nostril, 1 to 2 doses per hour as needed. Fastest and most cigarette-like, also the most habit-forming.

Combining a long-acting form (patch) with a short-acting form (gum, lozenge, inhaler, or spray) is more effective than either alone.

Safety monitoring

• Cravings and withdrawal symptoms. If cravings persist despite adequate NRT, the dose is probably too low.
• Skin reactions at the patch site. Rotating the site helps.
• Jaw pain or mouth soreness with gum.
• Mouth or throat irritation with lozenge and inhaler.
• Nasal irritation and sneezing with nasal spray, which usually settles.
• Cardiovascular symptoms in people with recent heart events. NRT is generally safer than continued smoking even in this group, but a prescriber should be involved.

What to expect

The first day or two on the patch, some people notice mild nausea or a headache. Vivid dreams are common with the 24-hour patch. Some people take it off at bedtime and switch to a short-acting form on waking. Cravings drop within the first few days, though breakthrough cravings still happen and that's where the gum or lozenge comes in.

The first two weeks are usually the hardest, especially the cue-triggered cravings (morning coffee, driving, after meals). NRT reduces the intensity of those cravings but doesn't erase them. Behavioral strategies, whether counseling or a quit-smoking app, do meaningful work here alongside the medication.

Common side effects

Most people get some side effects. The common ones include:

• Skin irritation at the patch site.
• Vivid dreams with the 24-hour patch.
• Jaw fatigue or soreness with the gum.
• Hiccups or heartburn with the gum or lozenge.
• Mouth or throat irritation with the lozenge or inhaler.
• Nasal irritation, sneezing, watery eyes with the nasal spray.
• Mild nausea, especially at the start.

Most of these settle in a week or two. Rotating patch sites, chewing gum more slowly, and taking a break between lozenges usually help.

Serious side effects and warnings

Serious problems from NRT are uncommon, and even in higher-risk groups NRT is generally safer than continued smoking.

• Cardiovascular events. The label historically warned about NRT after a recent heart attack, but current guidelines and evidence support NRT even in most cardiac patients because continued smoking is more dangerous. Talk with a cardiologist if there's a recent event.
• Skin reactions. Occasionally severe, especially with the patch. Rotating sites and treating any rash helps.
• Nicotine toxicity. Rare with recommended use. Signs are nausea, vomiting, sweating, dizziness. More common in children who get hold of the products, which is why safe storage matters.
• Pregnancy considerations, see below.
• Sustained NRT use past the intended course. Some people use gum or lozenges long-term, which is safer than smoking but isn't the original plan.

Sexual and relational effects

NRT itself isn't a common cause of sexual side effects. Quitting smoking generally improves erectile function, exercise tolerance, and how food tastes, which shows up in relationships over time. If sexual function shifts after starting NRT, that's worth raising with the prescriber.

Weight, appetite, and sleep

Weight gain during smoking cessation is common because nicotine suppresses appetite and quitting reverses that. NRT partially blunts the appetite rebound but doesn't prevent weight gain. Sleep effects are the vivid dreams from the 24-hour patch, occasional insomnia at the start, and generally improved sleep over time as smoking-related awakenings resolve.

Starting and dosing basics

This section is general background, not a dosing instruction for any individual. The right form and dose is a decision for a prescriber or pharmacist.

Match the starting dose to how much you smoke. The single most common mistake with NRT is underdosing. If cravings are severe on 21 mg, the answer is often to add a short-acting form on top rather than push through. Combining a patch with gum or lozenge is the standard for heavier smokers and works better than either alone in trials.

Set a quit date. Start the patch the morning of the quit date, or a few days before. Have the gum or lozenge on hand from day one for breakthrough cravings. Read the label on the gum or lozenge; the chew-and-park technique matters for the gum to actually work.

Missed doses and interactions

If you forget the patch, put one on when you remember. If it's late in the day, some people skip and start fresh the next morning to avoid sleep problems.

NRT has few significant drug interactions. Smoking itself induces some liver enzymes, so quitting can raise blood levels of a few medications (clozapine, olanzapine, theophylline, some others). If you're on those, your prescriber should know you're quitting so doses can be adjusted. Give every prescriber and pharmacist a full list of your medications and supplements, including over-the-counter ones.

Stopping and tapering

The standard is 8 to 12 weeks total, stepping the patch down from 21 mg to 14 mg to 7 mg. Short-acting NRT is tapered as cravings ease. Some people extend NRT longer, which is safer than restarting cigarettes. There's no medical reason to force a quick taper if you're still worried about relapse.

Pregnancy and breastfeeding

Behavioral counseling is the first step for smoking cessation in pregnancy. Continued smoking has real, well-documented harms to the pregnancy, so if counseling alone isn't working, NRT is generally preferred over continued smoking. Intermittent forms (gum, lozenge) are often chosen over the patch in pregnancy so that fetal nicotine exposure is lower and dosing matches craving. NRT does pass into breast milk in small amounts, but breastfeeding while on NRT is generally considered safer than smoking.

Anyone who is pregnant, planning a pregnancy, or breastfeeding should talk it through with their prescriber so the specific risks and benefits can be weighed.

Cost and generic availability

The patch, gum, and lozenge are available over the counter as generics and store brands, and are usually inexpensive. Under the Affordable Care Act, most insurance plans cover NRT with no copay when prescribed, even for OTC forms. Many state Medicaid programs and quitlines provide free NRT. The inhaler and nasal spray are prescription only and more expensive.

Common questions

Isn't nicotine the harmful part of smoking? No, that's the common myth. Nicotine is the addictive part, but the harm comes from combustion products (tar, carbon monoxide, and thousands of other chemicals). NRT delivers nicotine without any of that.

Can I use it and smoke at the same time? Yes, especially in the reduce-then-quit approach. There's no dangerous interaction, and combining is safer than smoking alone. That said, the goal is still to stop smoking.

Which form is best? The patch as a base, plus gum or lozenge for breakthrough cravings, is the combination with the strongest evidence. If gum or lozenge doesn't work for your mouth, the inhaler is an alternative. The nasal spray works fastest and is the most cigarette-like, which also makes it the hardest to stop.

Will I get addicted to the gum? Some people do use the gum or lozenge long-term. It's not ideal but it's much safer than smoking. If you get stuck on it, that's something to bring up with a prescriber.

Does it work for vape quitting? Some. There aren't strong trials specifically in vape users, but the same principles apply. Match the dose to how much nicotine you're using.

Questions to ask your prescriber

• Which form or combination fits my situation best?
• What dose should I start at, and when do I step down?
• What should I do if cravings break through?
• If I slip and smoke, do I stop the NRT?
• What else should I be doing alongside the medication?

Sources

This guide draws on current prescribing information and public health references. It is reviewed for clinical accuracy and updated as guidance changes, and current as of June 8, 2026.

• U.S. Food and Drug Administration. Nicotine replacement product prescribing information (Nicoderm CQ, Nicorette, Nicotrol).
• DailyMed, U.S. National Library of Medicine. Nicotine patch, gum, lozenge, inhaler, and nasal spray labels.
• MedlinePlus, U.S. National Library of Medicine. Nicotine transdermal patch.
• U.S. Preventive Services Task Force. Tobacco Smoking Cessation in Adults recommendation.
• American Thoracic Society. Initial Pharmacologic Treatment of Tobacco Use in Adults clinical practice guideline.
• Centers for Disease Control and Prevention. Smoking cessation and NRT information.