What Is Nicotine
What Is
Nicotine
A natural stimulant alkaloid produced by plants in the nightshade family. Addictive. Not itself the main driver of smoking harm. That is combustion. UK vape e-liquid uses the same pharmaceutical-grade nicotine found in NRT patches plus gum, capped at 20mg/ml under UK law.
Nicotine is a natural stimulant alkaloid produced by plants in the nightshade family, mainly tobacco. It binds to acetylcholine receptors in the brain, producing mild stimulation, slight mood elevation plus increased heart rate. Nicotine is addictive. Nicotine is not itself the main cause of smoking harm. Smoking harm comes overwhelmingly from combustion products including tar plus carbon monoxide. That is why Public Health England estimates vaping is around 95% less harmful than smoking. UK vape e-liquid contains the same pharmaceutical-grade nicotine as NRT patches, gum plus sprays. Strength is capped at 20mg/ml under UK TPD rules. Typical adult vape strengths are 10mg/ml or 20mg/ml in nic salts for ex-smokers plus 3mg/ml in shortfills for sub-ohm users.
Three facts that frame
nicotine in UK vaping
Per-cigarette absorption, UK strength ceiling plus receptor binding speed.
Per cigarette absorbed
Typical nicotine delivered to the bloodstream by one cigarette. Varies by brand plus depth of inhalation.
UK e-liquid ceiling
The UK TPD maximum for any vape e-liquid. Sets an upper limit on nicotine exposure per puff across every UK SKU.
Brain onset from lungs
How quickly nicotine inhaled from a cigarette or vape reaches the brain. Slower via gum or patch.
Nicotine in five parts for UK adult readers
Nicotine is one of the most studied drugs on earth. The basic science is well settled. The policy around nicotine is more contested. Both matter for UK adult vapers or anyone considering switching from smoking. Five parts cover the full picture.
Part 1: what nicotine is chemically
Nicotine is a natural stimulant alkaloid. The technical facts:
- Chemical formula C10H14N2. A nitrogen-containing organic compound.
- Naturally produced by plants in the nightshade (Solanaceae) family.
- Tobacco is the main source. Nicotiana tabacum plants produce nicotine as a natural insect repellent.
- Present in tiny amounts in tomatoes, potatoes plus aubergines from the same plant family.
- Bitter-tasting plus colourless in pure form.
Part 2: what nicotine does in the body
Nicotine acts on the central nervous system:
- Binds to nicotinic acetylcholine receptors in the brain. These are natural receptors that normally respond to the neurotransmitter acetylcholine.
- Triggers release of dopamine plus noradrenaline. This produces mild pleasure plus alertness.
- Raises heart rate typically by 10 to 20 beats per minute.
- Constricts blood vessels slightly. Raises blood pressure briefly.
- Reduces appetite in some users.
- Effects peak in minutes. Clear within hours.
Part 3: the addiction profile
Nicotine is addictive. The characteristics:
- Dopamine pathway activation produces the reward loop behind addiction.
- Tolerance develops. Regular users need more nicotine for the same effect.
- Withdrawal symptoms include irritability, anxiety plus cravings when use stops.
- Addiction severity varies. Some users develop strong dependence quickly. Others do not.
- Delivery speed matters. Fast delivery (inhalation) is more addictive than slow delivery (patches).
- Stopping is achievable. Millions of UK adults have quit nicotine entirely.
Part 4: nicotine vs smoking harm
The key distinction between nicotine plus smoking harm:
- Nicotine itself is not a major carcinogen. WHO classifies nicotine separately from tobacco smoke carcinogens.
- Smoking harm is overwhelmingly combustion-driven. Tar, carbon monoxide plus 7,000+ other chemicals produced by burning tobacco drive the disease burden.
- Public Health England’s 95% less harmful estimate for vaping is based on this distinction.
- NHS Stop Smoking Service uses NRT. Patches, gum plus sprays deliver nicotine without combustion exactly because nicotine alone is much lower risk than smoking.
- Cardiovascular risk of nicotine alone. Present but modest. Not comparable to smoking cardiovascular risk.
Part 5: UK nicotine regulation
Nicotine is regulated across every delivery route in the UK:
- Vape e-liquid. Capped at 20mg/ml under the Tobacco and Related Products Regulations 2016.
- NRT patches, gum plus sprays. Licensed medicines under the MHRA. Prescribable on the NHS.
- Cigarettes. Unregulated per-stick nicotine but under heavy tax plus advertising restrictions.
- Snus. Banned in the UK since 1992 except in Sweden under an EU exemption.
- Nicotine pouches. Currently unregulated under TPD but covered by general consumer safety law plus the proposed Tobacco and Vapes Bill.
- Synthetic nicotine. Treated identically to plant-derived nicotine under UK TPD notification.
Four facts UK adults should
know about nicotine itself
It is addictive
Nicotine activates the brain’s dopamine reward pathway. Tolerance develops. Withdrawal occurs on stopping. Millions quit successfully however.
Not the main smoking harm
Combustion products drive most smoking harm. Nicotine is not itself a major carcinogen. PHE 95% less harmful estimate reflects this.
Same as NRT nicotine
UK vape e-liquid nicotine is the same pharmaceutical-grade substance as in NHS-licensed NRT patches plus gum.
Not for non-smokers
UK adult vaping is intended for ex-smokers. Nicotine is addictive. Non-smokers plus young people should not start.
UK nicotine delivery routes
compared side by side
The same nicotine reaches the user very differently depending on how it is delivered. The harm profile depends heavily on route, not just on nicotine itself.
Vapes plus NRT
- ✓Vape e-liquid. Up to 20mg/ml. PHE 95% less harmful than smoking.
- ✓NRT patches. 24-hour steady nicotine delivery via skin.
- ✓NRT gum. 2mg or 4mg per piece. Oral delivery.
- ✓NRT spray or inhalator. Fast-acting for cravings.
- ✓Nicotine pouches. Tobacco-free oral pouches.
- ✓No combustion in any of these. No tar. No CO.
Smoking
- ✗Cigarettes deliver around 1mg nicotine per stick.
- ✗Plus 7,000+ combustion chemicals.
- ✗Plus 70+ known carcinogens.
- ✗Plus tar deposition in lungs.
- ✗Plus carbon monoxide cardiovascular load.
- ✗Leading cause of preventable death in the UK.
Nicotine sits at the centre of every UK vape knowledge question. For the full picture visit our vaping FAQs hub. Every major UK vape question sits inside.
Back to the Vaping FAQs hub
This article sits inside our complete FAQs knowledge base. Head back to the hub for the full index covering MHRA rules, TPD, the 2025 disposable ban, the 2026 vape tax plus retailer compliance.
More UK vape knowledge basics
Nicotine sits inside the wider ingredient plus regulatory picture. Our breakdown on what is in a vape covers the four ingredient families including nicotine. Our foundational overview on what is vaping puts nicotine delivery in the wider context of how UK adult vaping works. For the strength ceiling context our guide on why nicotine strength is capped at 20mg in the UK explains why UK products stop where they do.