Nicotine replacement therapy (NRT) is a group of products that deliver controlled doses of nicotine without the tar, carbon monoxide, and thousands of other chemicals found in cigarette smoke. The idea is straightforward: by supplying your body with nicotine through a safer route, NRT reduces withdrawal symptoms and cravings long enough for you to break the behavioral habit of smoking. In clinical trials, NRT increases successful quit rates from roughly 10% to 17% compared to quitting without any medication.
How NRT Works in Your Brain
When you smoke, nicotine reaches your brain within seconds and activates receptors that trigger the release of dopamine, the chemical tied to pleasure and reward. Over time, your brain builds more of these receptors and comes to depend on regular nicotine hits to feel normal. When you stop smoking abruptly, those receptors go unsatisfied, and the result is withdrawal: irritability, anxiety, difficulty concentrating, and intense cravings.
NRT works by partially filling those same receptors with a steady, lower level of nicotine. This takes the edge off withdrawal without reproducing the rapid spike that makes cigarettes so addictive. Because NRT delivers nicotine more slowly than inhaled smoke, it’s far less likely to reinforce the addictive cycle. The goal is to gradually reduce the dose over weeks until your brain adjusts to functioning without nicotine at all.
The Five FDA-Approved Types
Three forms of NRT are available over the counter in the U.S. for adults 18 and older:
- Nicotine patches stick to the skin and release a steady stream of nicotine over 16 or 24 hours, depending on the brand. They come in three strengths (7 mg, 14 mg, and 21 mg). If you smoke more than 10 cigarettes a day, the typical starting point is the 21 mg patch.
- Nicotine gum comes in 2 mg and 4 mg strengths and provides nicotine on demand when cravings hit.
- Nicotine lozenges dissolve in your mouth and work similarly to the gum, offering a burst of nicotine when you need it.
Two additional forms require a prescription:
- Nicotine nasal spray delivers nicotine through the lining of the nose for the fastest relief of any NRT product.
- Nicotine inhaler resembles a cigarette holder and releases nicotine vapor that gets absorbed through the mouth and throat, which some people find satisfying because it mimics the hand-to-mouth ritual of smoking.
How to Use Each Product
The patch is the simplest to use. You apply one each morning to a clean, dry, hairless area of skin (upper arm, chest, or back), rotating the spot daily to avoid irritation. Over 8 to 12 weeks, you step down from the higher dose to progressively lower ones, with the goal of stopping entirely.
Nicotine gum requires a specific technique that most people get wrong at first. You bite down slowly until you feel a tingling or peppery sensation, then “park” the gum between your cheek and gums for about a minute to let the nicotine absorb through the lining of your mouth. Then you chew again and park again, repeating the cycle for about 30 minutes. Chewing it like regular gum sends most of the nicotine to your stomach, where it causes nausea instead of reaching your bloodstream effectively. You should also avoid acidic drinks like coffee, juice, or soda for 15 minutes before and during use, since acid reduces absorption.
Lozenges follow a similar principle. Let them dissolve slowly in your mouth rather than chewing or swallowing them, and avoid eating or drinking while one is in.
How Effective Is NRT?
NRT roughly doubles your odds of quitting compared to willpower alone. The absolute numbers are modest but meaningful: in large analyses, about 17 out of 100 people using NRT stayed smoke-free, compared to about 10 out of 100 using a placebo. That means for every 15 people who use NRT, one additional person quits who wouldn’t have otherwise. Those numbers shift depending on how motivated the group is to begin with. In populations with very low baseline quit rates (3 to 5%), the benefit is smaller in absolute terms, while in groups already highly motivated (baseline around 15%), the benefit is larger.
Many clinicians recommend combining a long-acting product like the patch with a short-acting one like gum or lozenges. The patch handles your baseline nicotine level while the gum or lozenge covers sudden cravings. A large randomized trial compared this combination approach to the patch alone and found quit rates of 26.8% versus 22.8% at six months. By one year, however, the difference had essentially disappeared, with both groups at about 20 to 21%. So combination therapy may help more in the early months, but long-term success rates end up similar.
Common Side Effects
Because all NRT products contain nicotine, they share a few general side effects: nausea, headache, and a racing heart, particularly if the dose is too high for your level of dependence. Beyond those, side effects depend on the delivery method.
Patches commonly cause skin redness or irritation at the application site, which is why rotating locations matters. Some people also experience vivid or unusual dreams, especially with 24-hour patches. Switching to a 16-hour patch that you remove before bed usually solves this. Nicotine gum can cause jaw soreness, throat irritation, and mouth sores, often because people chew too aggressively or too often. Lozenges can cause hiccups and heartburn if used too quickly.
These side effects are generally mild and manageable, and they’re far less harmful than continuing to smoke. Nicotine itself, while addictive, is not the ingredient in cigarettes that causes cancer, lung disease, or heart attacks. Those come from the combustion products in smoke.
Safety for People With Heart Disease
NRT’s safety in people with cardiovascular conditions has been a point of discussion. Some guidelines, including those from the Mayo Clinic and the Ottawa Model for Smoking Cessation, support using NRT in patients at risk for heart disease. A U.S. Surgeon General report takes a more cautious approach, recommending that NRT be avoided for two weeks following a major cardiovascular event like a heart attack. The key context is that continuing to smoke after a heart event is far more dangerous than using NRT, so the risk-benefit calculation almost always favors NRT once the acute period has passed.
How Long Treatment Lasts
The standard course runs 8 to 12 weeks, with a gradual step-down in dose. For patches, this typically means starting at 21 mg for several weeks, dropping to 14 mg, then finishing at 7 mg before stopping. Gum and lozenges follow a similar reduction schedule, cutting the number of pieces used per day over time.
Some people benefit from longer courses. Research supports the safety of extended NRT use up to 52 weeks, particularly for heavy smokers or those who have relapsed on shorter courses. Long-term NRT can reduce the rewarding effects of cigarettes, help people smoke less even if they aren’t ready to fully quit, and improve quit rates. There is no established harm from using NRT for months beyond the standard timeline, and it remains far safer than returning to smoking.
What NRT Costs
Costs vary widely depending on the product, brand, and where you buy it. Nicotine patches typically run between $20 and $55 for a two-week supply at the lower end, with some programs charging up to $140 for an eight-week course. Combination therapy (patches plus gum or lozenges) is more expensive, with two-week supplies ranging from roughly $87 to $213 in various community programs. For comparison, a pack-a-day smoking habit costs between $2,500 and $5,000 per year depending on where you live, so even a full 12-week NRT course is a fraction of what you’d spend on cigarettes.
Many insurance plans cover NRT, and most state Medicaid programs provide it free or at reduced cost. State quitlines (reachable at 1-800-QUIT-NOW in the U.S.) often mail free patches, gum, or lozenges directly to your home.