What Nicotine Strength Should I Choose? A UK Guide
Nicotine strength is the single decision that makes or breaks a switch to vaping. Get it right and cigarettes lose their pull surprisingly fast. Get it wrong nearly always too weak and you'll vape constantly, feel unsatisfied, and drift back to smoking within a fortnight while concluding that "vaping doesn't work for me."
This guide gives you a straight answer based on how much you smoke, explains the nic salt vs freebase question in plain terms, and covers when (and whether) to step down.
The short answer
Match strength to your current smoking habit. The legal maximum in the UK is 20mg/ml, and here's how the range maps out:
| Your smoking habit | Strength | Nicotine type |
|---|---|---|
| 20+ a day, or you smoke within 30 min of waking | 20mg | Nic salt |
| 10–20 a day | 10–20mg | Nic salt |
| 5–10 a day | 5–10mg | Nic salt |
| A few a day, or social smoker | 3–6mg | Freebase or nic salt |
| Roll-ups (strong tobacco) | 10–20mg | Nic salt |
| Don't smoke | Don't start vaping |
Two rules sit behind that table:
If you're between two strengths, take the higher one. Under-dosing is the classic beginner error. Too much nicotine gives you obvious, temporary signals slight dizziness, a harsh throat and you simply vape less. Too little gives you no signal at all except a vague dissatisfaction that ends with buying a pack of cigarettes.
The "30 minutes after waking" question matters more than your daily count. It's the measure stop-smoking services use to gauge dependence. If your first cigarette comes within half an hour of getting up, treat yourself as a heavier smoker regardless of the daily total, and start at 20mg.
Nic salt or freebase? The two-minute version
E-liquid nicotine comes in two chemical forms, and the difference is mostly about how it feels and how fast it works.
Nicotine salts are treated with an acid that makes them smooth to inhale even at high strengths, and they reach your bloodstream quickly closer to a cigarette's timing. This is why a 20mg nic salt is perfectly vapeable while a 20mg freebase would take the roof off your mouth.
Freebase nicotine is the older form. It absorbs more slowly and delivers a sharper throat hit at any given strength. Some ex-smokers genuinely like that scratch it's part of what a cigarette felt like which is why 3mg and 6mg freebase liquids still sell well to light vapers and sub-ohm users.
The practical rule: above 6mg, choose nic salts. Below that, it's preference. For most people switching from cigarettes with a pod kit, a 10mg or 20mg nic salt is the answer, and it's not a coincidence that those were the two strengths nearly every disposable vape used.
Why "start low and work up" is bad advice
You'll still see this suggested, usually borrowed from other contexts where easing in makes sense. For smokers switching to vaping, it's backwards.
Nicotine is what you're already dependent on; the vape's job is to deliver it well enough that cigarettes become unnecessary. Start too low and the vape fails at its one job during exactly the window the first two weeks when your smoking habit is fighting hardest to reassert itself. You end up "dual using": vaping all day and smoking, which is the worst of both worlds.
Start at a properly matched strength, let the vape actually satisfy the craving, and reduce later from a position of stability if you want to. Nobody fails to quit smoking because their e-liquid was slightly too strong for a week.
Signs you've got the strength wrong
Your body gives fairly clear feedback within a few days. Read it honestly:
Too weak:
- You're vaping almost constantly and the device is never out of your hand
- Cravings for a cigarette persist even straight after vaping
- You get through e-liquid alarmingly fast
- You feel irritable in a way that a cigarette would fix
Too strong:
- Light-headedness or a mild headache after a few puffs
- A queasy feeling, especially early in the day
- Harshness in the throat that a flavour change doesn't fix
- You find yourself taking one or two puffs and putting it down which, to be fair, is how MTL vaping is meant to work, so only count this alongside the other signs
Too weak → move up a step (5mg → 10mg → 20mg). Too strong → move down one, or switch that strength from freebase to nic salt if you haven't already, since the salt form is far gentler at the same number.
Stepping down: optional, not mandatory
Plenty of vapers reduce strength over time 20mg to 10mg after a few months, then perhaps to 5mg and it's a reasonable goal. Three honest notes on it, though:
- There's no schedule you're supposed to follow. Some people stay on 20mg for years. The NHS position is clear that the priority is staying off cigarettes; the strength you need to do that is the right strength.
- Drop one step at a time and give it two weeks. If cravings for cigarettes return, go back up. A relapse to smoking costs you far more than staying on a higher strength ever would.
- Watch for compensation. If you drop from 20mg to 10mg and simply vape twice as much, you've changed nothing except your e-liquid bill. That's the signal you moved too early.
A note on 0mg
Nicotine-free e-liquid has its uses some long-term vapers finish their reduction there, and some people just like the flavour and ritual. But as a starting point for a smoker it almost never works, for the obvious reason: it doesn't address the thing you're actually dependent on. If you're switching from cigarettes, 0mg is a possible destination, not a departure gate.
Quick summary
Pick your strength by matching your smoking: 20mg nic salts for a pack a day or a first-cigarette-on-waking habit, 10mg for moderate smokers, 5–6mg for light smokers, freebase only at the low end if you want a sharper throat hit. When in doubt, go higher under-dosing is the mistake that sends people back to cigarettes. Expect clear signals within days if you've misjudged, adjust one step at a time, and treat stepping down as optional. The right strength is the one that keeps you off cigarettes.
FAQs
What nicotine strength is equal to a pack of cigarettes a day? There's no exact conversion, but 20mg nic salts (the UK legal maximum) is the standard recommendation for pack-a-day smokers, and it's what most heavy smokers find satisfying in a pod kit.
What's the difference between 10mg and 20mg nic salts? 20mg delivers roughly twice the nicotine per puff suited to heavier smokers or anyone who smokes soon after waking. 10mg suits moderate smokers (roughly 10–15 a day). If 10mg leaves you chain-vaping, move up.
Is 20mg of nicotine a lot? It's the UK/EU legal maximum, set by the TPD regulations, and it's the appropriate strength for heavy smokers using nic salts. In a smooth nic salt formulation it doesn't feel harsh the way 20mg freebase would.
Should I start with a low nicotine strength? No this is the most common mistake. A strength too low to satisfy cravings is the fastest route back to cigarettes. Match your smoking habit and reduce later if you choose to.
Can I mix nicotine strengths? Yes. Mixing equal parts of a 20mg and a 10mg bottle of the same type gives you roughly 15mg, which is a handy way to create in-between steps when reducing.
Is nicotine what causes the harm in smoking? The serious harm from smoking comes overwhelmingly from burning tobacco tar and carbon monoxide not from nicotine itself. Nicotine is addictive and not risk-free, but it's not what causes smoking-related cancer. That's the basis on which the NHS supports vaping as a quitting tool for smokers.