What Is Vaping
What Is
Vaping
Inhaling vapour from a battery-powered device that heats e-liquid. No tobacco. No combustion. No tar. Public Health England estimates vaping is around 95% less harmful than smoking. Around 5.2 million UK adults vape today mostly as an alternative to cigarettes.
Vaping is inhaling vapour produced by heating e-liquid in a battery-powered device. No tobacco leaf. No combustion. No tar. No carbon monoxide. Public Health England estimates vaping is around 95% less harmful than smoking. Around 5.2 million UK adults vape as of ASH 2025 data. Most are ex-smokers using vaping as a lower-harm alternative to cigarettes. Every UK vape product is regulated under the Tobacco and Related Products Regulations 2016 with nicotine strength capped at 20mg/ml plus tank capacity capped at 2ml. Vaping is not risk-free. It is intended as a switching option for adult smokers. Not for non-smokers plus not for young people.
Three numbers that define
UK adult vaping today
User count, harm reduction estimate plus strength ceiling. The headline facts.
UK adult vapers
ASH Great Britain 2025 estimate of UK adults currently vaping. The highest figure on record.
Less harmful than smoking
Public Health England’s widely cited 2015 estimate reaffirmed in 2018. The headline harm reduction figure.
UK nicotine cap
Maximum nicotine strength for any UK-legal vape e-liquid under the TPD framework.
Vaping explained for UK adults in five parts
Vaping gets talked about a lot but the basics are simpler than the headlines suggest. Five parts cover everything a UK adult considering vaping or recently switched needs to know.
Part 1: what vaping actually is
Vaping is the use of a battery-powered device that heats a flavoured liquid (e-liquid) into a vapour that the user inhales. Key features:
- No tobacco leaf. E-liquid does not contain tobacco.
- No combustion. Nothing burns. The coil heats the liquid to around 200 degrees Celsius but does not ignite it.
- No tar. The black sticky residue from tobacco smoke is not produced.
- No carbon monoxide. The gas that causes much of smoking’s cardiovascular harm is not produced.
- Water vapour, PG, VG, nicotine and flavourings are what the user inhales.
Part 2: how a vape device works
Four components in every UK-legal vape device:
- Battery. Lithium-ion cell providing power. Rechargeable in refillable devices.
- Coil or atomiser. A small resistance wire that heats up when the device is activated.
- Tank or pod. Holds e-liquid. Capped at 2ml under UK TPD rules.
- Mouthpiece. Delivers vapour to the user.
- Activation. Draw-activated (like cigarettes) or button-activated. Both are common.
A complete draw takes 2 to 3 seconds. Vapour is produced as long as the user is drawing plus stops when they stop.
Part 3: what is in e-liquid
Every UK TPD-compliant e-liquid contains four ingredient families:
- Propylene glycol (PG). Carries flavour plus produces throat hit. Food-grade ingredient also used in asthma inhalers.
- Vegetable glycerin (VG). Produces vapour cloud. Food-grade ingredient used in countless foods plus medicines.
- Flavourings. Food-grade plus cosmetic-grade aromas. Disclosed to MHRA via the UK notification system.
- Nicotine. Optional. Ranges from 0mg/ml (nicotine-free) to 20mg/ml (UK legal maximum).
UK TPD rules ban certain substances including caffeine, taurine, vitamins or anything that could create an impression of a health benefit.
Part 4: why UK adults vape
ASH 2025 data gives a clear picture of why UK adults vape:
- To quit or reduce smoking. Around 65% of adult vapers cite cessation or smoking reduction as the main reason.
- Lower cost than smoking. A pack-a-day smoker saves around £3,000 per year by switching to vaping.
- Fewer social restrictions. Vapes can be used in places cigarettes cannot such as outdoor dining areas.
- Flavour variety. Fruit, menthol, tobacco, dessert plus more across thousands of SKUs.
- Perceived lower harm. The 95% less harmful figure from Public Health England drives switching decisions.
- Non-smokers rarely take up vaping. UK adult vaping is overwhelmingly an ex-smoker activity.
Part 5: how UK vaping is regulated
UK vape products sit under a comprehensive regulatory framework:
- Tobacco and Related Products Regulations 2016. UK transposition of EU TPD. Sets the design, labelling plus notification rules.
- MHRA notification. Every SKU must be registered with the Medicines and Healthcare products Regulatory Agency six months before sale.
- 20mg/ml nicotine cap. Applies to every UK-legal e-liquid.
- 2ml tank cap plus 10ml bottle cap. Physical design limits on every UK product.
- Age of sale 18. Plus Challenge 25 at every UK retail point.
- Disposable ban since June 2025. Single-use disposables are no longer legal to sell in the UK.
- Vape duty from 1 October 2026. £2.20 per 10ml excise duty on all e-liquid.
Four misconceptions UK adults
have about vaping
“Vaping is the same as smoking”
It is not. No tobacco. No combustion. No tar. Public Health England estimates 95% less harmful than smoking.
“Vape clouds are just water”
Mostly PG plus VG with some water. Vapour is not harmful in the way smoke is but it is not pure water either.
“Higher strength means better quality”
No. Strength is matched to smoker history. Most adult vapers settle at 10mg/ml nic salt. 20mg/ml is for heavy ex-smokers only.
“Vaping is unregulated”
Every UK vape product passes MHRA notification. UK vape regulation is among the strictest in the world for adult consumer products.
UK vaping vs
traditional smoking
What the PHE 95% less harmful figure actually looks like when you compare the two activities side by side.
The harm-reduced path
- ✓No tobacco leaf. E-liquid has no plant material.
- ✓No combustion. Heated not burned.
- ✓No tar. No sticky residue in lungs.
- ✓No carbon monoxide. No cardiovascular CO exposure.
- ✓Ingredient transparency. Full MHRA disclosure.
- ✓95% less harmful per PHE estimate.
The legacy activity
- ✗Tobacco leaf combustion. Plant material burned.
- ✗7,000+ chemicals in cigarette smoke.
- ✗70+ known carcinogens identified in smoke.
- ✗Tar deposition in lungs plus airways.
- ✗Carbon monoxide exposure. Major cardiovascular risk.
- ✗NHS cost around £2.6bn per year. Leading cause of preventable death in the UK.
Vaping basics connect to every other 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 for UK vape beginners
The natural next step is the practical side. Our beginner walk-through on how to vape covers every first-time step from unboxing to first draw. For the strength context our guide on why nicotine strength is capped at 20mg in the UK explains the UK ceiling plus how to match strength to smoking history. For the product safety assurance our piece on what it means if a vape product is MHRA compliant covers the check every UK vaper should make.