Nicotine replacement therapy (NRT) — patches, gum, lozenges, inhalers, and nasal sprays — is the most widely available pharmacological help for quitting smoking. It is sold over the counter in most countries, costs less than continued smoking within weeks, and has been used safely in schizophrenia for more than 30 years. The main reason it sometimes fails in this population is not the medication itself but how it is dosed and combined.
NRT in adequate doses, usually combining a patch with a short-acting form, is safe and effective in schizophrenia and should be offered routinely.
What NRT does
NRT delivers nicotine without the tar, carbon monoxide, and roughly 7,000 other combustion byproducts that make cigarettes harmful. By keeping nicotine in the system, it reduces withdrawal symptoms (irritability, low mood, poor concentration, restlessness, intense craving) that drive most relapse in the first two weeks. Used long enough — typically 8 to 12 weeks at the starting dose, with gradual reduction afterwards — it doubles the chance of long-term abstinence compared with placebo, according to the 2018 Cochrane review by Hartmann-Boyce and colleagues.
Is NRT safe in schizophrenia?
Yes. The FDA reviewed safety data in 2016 and found no clear evidence of increased serious neuropsychiatric events with NRT or other cessation medicines in people with mental illness, including schizophrenia. The EAGLES trial (Anthenelli et al., The Lancet, 2016) — the largest cessation trial ever conducted in psychiatric and non-psychiatric populations — confirmed this finding for varenicline, bupropion, and the nicotine patch.
The most common mistake: underdosing
People with schizophrenia who smoke tend to extract more nicotine per cigarette than the general population. A pack-a-day smoker is often ingesting the equivalent of 30 to 40 mg of nicotine daily. A single 21 mg patch — the standard starting dose — is therefore not always enough. Combination NRT (patch plus short-acting form) gives a steady baseline plus on-demand relief for cravings, and is recommended by NICE, SAMHSA, and the 2008 AHRQ Public Health Service guideline.
How NRT is typically used
The exact dose is a conversation with your prescriber or pharmacist, but a common pattern is:
- Patch — 21 mg/day for heavy smokers (more than 10 cigarettes per day), 14 mg/day for lighter smokers, applied to clean dry skin and rotated daily.
- Short-acting form — gum (2 or 4 mg), lozenge (2 or 4 mg), inhaler, or nasal spray, used for cravings, typically every 1 to 2 hours when awake during the first weeks.
- Duration — at least 8 weeks at full dose, then taper. Some people benefit from longer use; there is no strong evidence of harm from extended NRT.
The forms in plain English
Patch
Slow steady release over 16 or 24 hours. Best as the foundation. Common side effects: skin irritation (rotate sites), vivid dreams (try the 16-hour version off overnight).
Gum
Chewed slowly until tingly, then "parked" in the cheek. Cheap and widely available. Bitter taste. Best for cravings tied to specific moments (after a meal, during a phone call).
Lozenge
Dissolved in the mouth, no chewing. Easier than gum for people with dental issues — relevant given the higher rates of dental problems in this population.
Inhaler
A plastic mouthpiece with a nicotine cartridge. Provides a hand-to-mouth ritual that some smokers find essential. Prescription only in many countries.
Nasal spray
The fastest-acting form; nicotine is absorbed within minutes. Helpful for very heavy smokers but causes more nasal irritation. Prescription only in the US.
The medication interaction worth knowing
Stopping smoking — even when you keep using nicotine via NRT — removes the CYP1A2-inducing effect of tobacco smoke. Clozapine and olanzapine levels can rise substantially over 1 to 2 weeks. Plan a dose review and, for clozapine, often a blood level check.
Note that nicotine itself does not cause this interaction — it is the smoke. So switching from cigarettes to NRT (or to vaping, see our vaping article) still triggers the change.
What to expect in the first few weeks
The first 72 hours are usually the hardest. Most people experience some combination of irritability, restlessness, low mood, increased appetite, and difficulty concentrating. NRT blunts but does not eliminate these. A few practical strategies:
- Plan a quit date a week in advance and stock up on supplies before you need them.
- Keep short-acting NRT within arm's reach for cravings — most cravings peak within 5 minutes.
- Drink water and walk when a craving hits. Movement reliably reduces craving intensity.
- Tell at least one person — your case manager, peer worker, or a friend — that you are quitting.
- Plan for the trigger moments: morning coffee, after meals, the smoke-break habit at work or at clinic.
If NRT alone is not enough
For people who have tried NRT without success, varenicline is generally the next step and has the strongest evidence for efficacy in schizophrenia. Bupropion is another option but should be used cautiously in people with a seizure history. A combination of varenicline plus patch is being studied with promising early results.
Cost and access
In the US, Medicaid covers NRT in all 50 states without prior authorisation. Most private insurance plans cover it. The SmokefreeTXT and 1-800-QUIT-NOW programs offer free NRT in many states alongside coaching. The UK NHS provides free NRT through stop-smoking services.
The honest summary
NRT is not a magic bullet. It works best as one piece of a plan that also includes coordination with your prescriber, behavioural support, and a realistic understanding that quitting is hard and relapse is common. Most successful quitters needed several attempts. NRT used adequately gives you the best chance of making this attempt the one that sticks.
This article is for educational purposes only and is not medical advice, diagnosis, or treatment. Always consult a qualified mental health professional. If you or someone you know is in crisis, call or text 988 in the US, or your local emergency number.