By VapeHQ · 9 min read

Choosing the correct nicotine strength is one of the most important decisions you will make when starting your vaping journey. Pick a level that is too low and you may find yourself reaching for a cigarette out of habit. Pick one that is too high and the experience can feel harsh or unpleasant. Getting it right from the outset makes making the switch far smoother, and it sets you up to enjoy vaping comfortably from day one.

The good news is that nicotine strength is not complicated once someone explains it in plain English. In this guide we will walk through what those numbers on the bottle mean, which strengths suit which kinds of vapers, and how to adjust at your own pace. If you are right at the beginning, you may find it useful to read alongside our complete switching guide, which covers the wider picture of moving away from cigarettes. By the end, you should feel confident making an informed choice rather than guessing, and our friendly advisers are always happy to talk things through if you would prefer a personal recommendation.

What mg/ml means in plain English

When you look at a bottle of e-liquid, you will see a number followed by either "mg" or "mg/ml". This simply tells you how much nicotine is contained in each millilitre of liquid. A 6mg e-liquid contains six milligrams of nicotine per millilitre. A 12mg e-liquid contains twelve. The higher the number, the more nicotine you take in with each puff.

You may also see strengths written as a percentage, such as 1.2% or 2%. To convert a percentage into mg/ml, move the decimal point one place to the right: 1.2% is the same as 12mg/ml, and 2% is the same as 20mg/ml. Choosing the right e-liquid strength is mostly about matching the nicotine your body is used to, so that vaping genuinely replaces the cigarettes rather than sitting alongside them.

The common strengths and who each suits

UK e-liquids are sold in a familiar set of nicotine strengths. Here is a plain guide to who tends to find each one comfortable. Treat these as starting points rather than strict rules, because everyone is a little different.

• 3mg: A very gentle level. This suits people who have largely settled into vaping and want only a small amount of nicotine, or those using high-powered devices that deliver a lot of vapour with each puff. It is usually too low for someone who has only just stopped smoking.
• 6mg: A light to moderate level. Often chosen by lighter smokers, or by vapers stepping down from a higher strength. It pairs well with mid-range devices.
• 10mg: A middle-ground strength found mostly in nic salt e-liquids. It works nicely for moderate smokers who want a satisfying hit without going to the maximum.
• 12mg: A moderate to strong freebase level. A common choice for people who smoked around ten to twenty cigarettes a day and are using a smaller, mouth-to-lung device.
• 18mg: A strong freebase level suited to heavier smokers who need a more pronounced throat sensation and a fuller nicotine delivery.
• 20mg: The strongest level permitted in the UK. Most often seen in nic salt form, it suits heavier smokers who want quick, comfortable satisfaction from a compact device.

You can browse the full range across our e-liquid collection to see how these strengths appear in practice.

Freebase vs nic salt and how that changes things

Two main types of nicotine are used in e-liquid, and the difference matters a great deal when choosing a strength. Understanding both will help you avoid picking a number that feels wrong for your setup.

Freebase nicotine

Freebase is the traditional form of nicotine used in vaping. It delivers a noticeable throat sensation, which many former smokers find reassuring because it echoes the feel of a cigarette. At higher strengths, however, freebase can become quite harsh, which is why levels above 12mg can feel rough for some people. Freebase is the type you will usually find in shortfills and many standard bottles.

Nic salt

Nic salt, short for nicotine salt, is a smoother form of nicotine. The chemistry is adjusted so that it feels gentler on the throat even at higher strengths, and it tends to be absorbed a little more quickly. This is why a 20mg nic salt can feel comfortable while a 20mg freebase would feel very harsh indeed. For many people making the switch, nic salt at 10mg or 20mg offers fast, satisfying relief from cravings without discomfort. You can explore the options in our nicotine salts range.

The practical takeaway is this: the same number means a different experience depending on the type. If you are choosing a nic salt, you can often go higher without harshness. If you are choosing freebase, a more moderate strength is usually kinder. Our friendly advisers can point you towards whichever suits you.

Matching strength to your smoking and your device

Two things shape the right starting strength more than anything else: how much you used to smoke, and the style of device you are using. Let us take each in turn.

Heavier smokers generally need more nicotine to feel settled, while lighter smokers do well on lower strengths. The device matters because of how much vapour it produces. A small mouth-to-lung (MTL) device, which draws like a cigarette, delivers less vapour per puff, so it pairs with higher strengths. A larger direct-to-lung (DTL) device produces big clouds, delivering far more nicotine per puff, so it needs a lower strength to stay comfortable. If you are weighing up the two styles, our guide to MTL vs DTL vaping explains the difference in more depth.

The table below brings these factors together into a suggested starting point. It is a guide rather than a prescription, and you can fine-tune from there.

If you are still deciding on hardware, it is worth reading how to choose your first vape kit when quitting smoking before you settle on a strength, since the two choices go hand in hand.

The UK 20mg/ml legal limit

In the UK, the law sets a maximum nicotine strength of 20mg/ml for e-liquids sold in nicotine-containing products. This cap was introduced under the Tobacco and Related Products Regulations and applies to all reputable retailers, so you will never see a compliant bottle stronger than 20mg. The same limit covers pre-filled pods and disposable products.

For most people making the switch, 20mg is more than enough, particularly in nic salt form where it feels smooth. There is also a practical limit on bottle sizes: any e-liquid containing nicotine is sold in bottles of 10ml or smaller, which is why you will see so many 10ml e-liquid options. Larger nicotine-free shortfills exist too, letting you add your own nicotine if you prefer.

How to adjust your nicotine strength over time

Your needs are likely to change as you go, and adjusting is a normal, healthy part of the process. There is no rush, and you should always move at your own pace.

If you find yourself vaping constantly, feeling unsatisfied, or thinking about cigarettes, your strength may be a little too low. Stepping up to the next level often settles this. On the other hand, if vaping leaves you feeling lightheaded, slightly queasy, or with an uncomfortable throat, your strength may be too high, and dropping down a level will usually help.

Over the longer term, many people gradually reduce their nicotine strength as their reliance lessens. A common path is to move from 18mg down to 12mg, then 6mg, and perhaps eventually to 3mg or nicotine-free. There is no obligation to do this and no fixed timetable. Some vapers stay at a comfortable level for years, and that is a perfectly valid choice for their wellbeing. When you feel ready to reduce, our pure e-liquid collection offers clean, simple flavours across a range of strengths to step down through.

If cravings are proving stubborn in those early weeks, you may find practical reassurance in our guide to managing cravings in the first month of vaping. For wider stop-smoking support, the NHS Better Health quit smoking service and the charity ASH both offer trustworthy, independent information.

Frequently asked questions

What nicotine strength should I start with if I smoked a pack a day?

A pack a day is a heavier smoking level, so most people in this position feel settled on 18mg freebase in a mouth-to-lung device, or 20mg nic salt for a smoother experience. You can always adjust once you see how it feels.

Is nic salt stronger than freebase?

Not in terms of the actual nicotine content, since the mg/ml number means the same thing. Nic salt simply feels smoother and is absorbed a little faster, which is why higher strengths are comfortable in salt form when they would feel harsh as freebase.

Can I mix two different nicotine strengths?

Yes. Combining a higher and a lower bottle of the same liquid gives you a strength somewhere in between, which is handy if you are stepping down gradually. Our friendly advisers can help you work out the right blend.

Why does my high-strength e-liquid feel harsh?

This usually happens when a strong freebase liquid is used, or when a high strength is paired with a powerful direct-to-lung device. Switching to a nic salt or lowering the strength generally makes things far more pleasant.

What is the highest nicotine strength I can buy in the UK?

The legal maximum is 20mg/ml. No compliant UK retailer sells nicotine-containing e-liquid stronger than this, and for most people it is ample.

Will a lower nicotine strength help me quit eventually?

Many people choose to reduce their nicotine strength step by step over time, and lower strengths make that easier. There is no set timetable, though, and you should only reduce when you feel ready.

Summary

Finding the right nicotine strength comes down to a few simple factors: how much you used to smoke, the type of nicotine you choose, and the style of device you vape with. Heavier smokers and smaller MTL devices call for higher strengths, while lighter smokers and bigger DTL devices suit lower ones. Nic salt lets you sit comfortably at higher levels, while freebase is kinder in moderate amounts. The UK caps nicotine at 20mg/ml, which is plenty for almost everyone. Above all, your ideal nicotine strength is the one that keeps you satisfied and away from cigarettes, and you can adjust it at your own pace. If you would like a personal recommendation, our friendly advisers are always glad to help.

More From Our Resource Library

• Your First Week Vaping: A Gentle Step-by-Step Guide
• How to Choose Your First Vape Kit When Quitting Smoking
• Managing Cravings in the First Month of Vaping

Vaping is intended for adult smokers and is substantially less harmful than smoking, though it is not risk-free. Nicotine is an addictive substance. This article is general information about your vaping journey and not medical advice. If you have health concerns or want tailored stop-smoking guidance, please speak with your GP, pharmacist, or a local stop-smoking service.