You wake up, and within twenty minutes you're reaching for a cigarette. Not because you want to -- because your body is already signaling that nicotine levels have dropped overnight. That's dependence. And it's exactly the problem nicotine replacement therapy is designed to address.
NRT doesn't help you want to quit. It helps your body tolerate quitting by giving it a controlled, lower dose of nicotine while you break the behavioral side of the habit. That's the distinction that matters.
What NRT Actually Does
Nicotine enters your bloodstream when you smoke and immediately binds to nicotinic acetylcholine receptors in your brain. Over time, chronic exposure causes your brain to upregulate these receptors -- it grows more of them to compensate for the constant stimulation. When you stop smoking, those excess receptors are suddenly understimulated. That's withdrawal: irritability, difficulty concentrating, disturbed sleep, powerful cravings.
NRT delivers nicotine without the combustion products -- no carbon monoxide, no tar, none of the 70+ known carcinogens in cigarette smoke. It keeps receptor stimulation high enough to prevent the worst withdrawal symptoms while the behavioral habit is being addressed separately.
The nicotine dose is lower than cigarettes, and it's delivered more slowly. That's intentional. The fast delivery of smoked nicotine is a major driver of dependence. NRT's slower absorption profile reduces the reinforcing "hit" while still managing withdrawal.
The Five Forms of NRT
Patches
Patches deliver nicotine continuously through the skin over 16 or 24 hours. They're the lowest-maintenance option and work best for managing the baseline, background craving that keeps you in a low-level state of withdrawal all day.
They come in three standard strengths (21mg, 14mg, 7mg for 24-hour patches; similar tiers for 16-hour). Most heavy smokers (more than 10 cigarettes daily) start at the highest dose and step down over 8--12 weeks.
What patches don't do well: handle acute breakthrough cravings, the sudden intense urge that hits when you smell smoke, finish a meal, or feel stressed. For those moments, you need a fast-acting form alongside the patch.
Nicotine Gum
Gum releases nicotine through the lining of your mouth -- not by swallowing. That's why the "chew and park" technique matters: chew a few times until you feel a tingle, then park the gum between your cheek and gum. Chewing continuously means you swallow the nicotine, which gets absorbed through the gut far less effectively.
Available in 2mg and 4mg. The 4mg is recommended for heavy smokers and for the morning craving, which is typically the most intense.
One thing to avoid: acidic drinks (coffee, juice) in the 15 minutes before and after -- acid interferes with nicotine absorption through the mouth lining.
Nicotine Lozenges
Lozenges work on the same mucosal absorption principle as gum but require no technique. You let them dissolve slowly in your mouth, moving them occasionally. Also available in 2mg and 4mg.
They're a useful option for people who find the gum texture unpleasant or who can't chew gum (dental work, jaw issues). The onset is slightly slower than gum but comparable.
Nicotine Inhalers
The inhaler is a plastic cartridge that vaporizes nicotine when you puff on it. Despite the name, most nicotine is absorbed in the mouth and throat, not the lungs. The mouthpiece design mimics the hand-to-mouth action of smoking, which some people find genuinely helpful for the behavioral component.
Onset is faster than patches but slower than gum. Useful for people who find the "hand action" part of smoking as difficult to give up as the nicotine itself.
Nasal Spray
The fastest-acting NRT available. Nicotine absorbs directly through the nasal lining, reaching the bloodstream in 5--10 minutes -- faster than gum or lozenges. Best suited for heavy smokers with rapid, intense craving patterns.
More side effects upfront (nasal irritation, sneezing, watery eyes), but these typically subside within a week or two as the nasal mucosa adapts.
The Evidence: What Works Best
A 2012 Cochrane review analyzing 150+ studies found that all NRT forms significantly increase quit rates compared to placebo -- roughly doubling the chances of success at 6 months. No single form is dramatically superior to another for most people.
What does make a significant difference: combination NRT.
Using a long-acting form (patch) alongside a fast-acting form (gum, lozenge, or inhaler) consistently outperforms either product used alone. The patch handles the steady-state withdrawal; the fast-acting product handles peak cravings. A 2012 Cochrane review on combination NRT found it was more effective than monotherapy, with evidence suggesting a 15--36% higher quit rate.
The practical implication: if you've tried NRT before and it didn't work, it's worth asking whether you used combination NRT or just a single product.
Starting Before Your Quit Date
A common misconception is that NRT only starts on quit day. It doesn't have to.
For people who aren't ready to stop abruptly, a "cut to quit" approach uses NRT alongside continued smoking to gradually reduce cigarette consumption before stopping completely. You use NRT during times when you'd normally smoke, progressively cutting down the number of cigarettes.
Research supports this as a valid approach. It reduces the day-one shock and can make the eventual quit day feel less all-or-nothing.
Common Mistakes
Stopping too soon. Most people who fail with NRT stop it after 2--4 weeks, when they feel like they don't need it anymore. Symptoms ease, they get overconfident. Standard guidance is 8--12 weeks minimum. Stopping early increases relapse risk.
Underdosing. Using a 14mg patch when you smoke 20+ cigarettes a day means the patch isn't delivering enough nicotine to adequately manage withdrawal. Heavy smokers often need the highest-dose patch, sometimes combined with a fast-acting form.
Not treating the behavioral component. NRT manages the physiological withdrawal. It doesn't address the cues and habits that trigger reaching for a cigarette. That's a separate problem that requires behavioral strategies -- identifying your triggers, building alternative responses, understanding the habit loop.
Treating a relapse as a reason to stop NRT. If you smoke while using NRT, don't immediately discard the patches. Assess why it happened, adjust the plan, and continue.
How Milo Works Alongside NRT
NRT and behavioral support aren't competing approaches -- they address different parts of the same problem. NRT reduces the physiological drive; behavioral tools help you handle the situations and emotions that make you reach for a cigarette.
Milo uses your Fagerstrom score from onboarding to understand your dependence level and calibrate support around your highest-risk moments. If NRT is part of your quit plan, Milo factors that in.
Your GP can help you determine the right NRT product and dose combination. Milo works alongside whatever method you choose.