Nic Strength in an E-liquid: Finding Your Perfect Vape Balance

Updated: October 2026

Choosing the right nicotine strength can help adults who are switching from smoking manage their cravings. Too much nicotine may cause nausea or dizziness. Your starting strength depends on previous smoking habits and your device.

This guide explains labels, compares freebase with nicotine salts and suggests common starting points. Browse e-liquids or nicotine salts before or after you have chosen your vape device. If you do not smoke or use nicotine, do not start vaping.

What does nicotine strength mean?

E-liquid nicotine strength is measured in milligrams per millilitre (mg/ml), often shortened on the label to “mg”. A 10ml bottle labelled 6mg contains 6mg of nicotine in each millilitre, or 60mg in the full bottle. You will not absorb all that nicotine. Your exposure depends on the liquid consumed, device and preferred vaping style.

Some labels display nicotine percentages instead: 3mg/ml is 0.3%, 10mg/ml is 1%, and 20mg/ml is 2%. The percentage describes liquid concentration, not an equivalent number of cigarettes.

Nicotine strength chart: freebase versus nicotine salts

Strength	Percentage	Common freebase use	Common nic salt use
0mg/ml	0%	Nicotine-free liquid for people avoiding nicotine	No nicotine; salt/freebase distinction does not apply
3mg/ml	0.3%	Lower-strength option, often used with higher-vapour devices	Available in some ranges, less common
5–6mg/ml	0.5–0.6%	Lower to moderate strength, depending on equipment	5mg options available in selected ranges
10mg/ml	1%	Available but less common	Common choice for lower-power MTL pods
12mg/ml	1.2%	Common for tighter-draw pens and MTL devices	Less common than 10mg or 20mg
18mg/ml	1.8%	Strong freebase option for low-power MTL devices	Availability varies
20mg/ml	2%	UK legal maximum; uncommon in freebase ranges	Common highest-strength UK option for low-power pods

MTL = mouth-to-lung. 

Freebase nicotine or nicotine salts?

Freebase nicotine is the conventional nicotine formulation in e-liquids. Higher concentrations tend to give a stronger throat hit. Common strengths include 3mg, 6mg, 12mg and 18mg.

Nicotine salts combine nicotine with an acid to alter the liquid's chemistry. They often feel smoother at the same labelled strength as freebase liquids and are widely used in small refillable pods. But 10mg nicotine salt still contains 10mg of nicotine per millilitre, just like 10mg freebase. Absorption speed and total delivery depend on the liquid, device and vaping habits.

See nic salt versus freebase versus nic shots and What is nicotine salt? for more.

Picking a starting strength by cigarettes per day

Cigarette counts are only a rough guide. These ranges assume an adult moving to a low-power mouth-to-lung (MTL) device.

Previous smoking pattern	Possible starting point to discuss	Practical consideration
Fewer than 10 cigarettes a day	Around 5–10mg nic salt or 6mg freebase	Choose according to cravings and throat comfort
Around 10 cigarettes a day	Around 10mg nic salt or 12mg freebase	Review whether cravings are controlled
Around 10–20 cigarettes a day	Around 10–20mg nic salt or 12–18mg freebase	Higher dependence may require the upper end
More than 20 a day or cigarette soon after waking	Often 18–20mg in a suitable low-power device	Seek individual advice from a Stop Smoking Service

NHS vaping advice recommends choosing enough nicotine to manage withdrawal and getting help from a specialist vape shop or local Stop Smoking Service. If cravings persist, reassess the strength and device.

For more detail, read 10mg versus 20mg nic salt.

Match nicotine strength to your vape device

Refillable pod kits and small vape pens: Most MTL pod kits use lower power and a relatively small amount of e-liquid per puff. Many people switching from smoking use 10mg or 20mg nic salts, or compatible freebase liquid (3/6/12/18mg). A 50/50 VG/PG ratio is perfect for these kits.

Sub-ohm kits: Sub-ohm vape kits heat more liquid per puff and create much more vapour per puff. Lower strengths such as 0–3mg freebase, and sometimes 6mg where appropriate, are more typical. High-strength 20mg nic salts are generally unsuitable for high-power direct-to-lung use as although they are generally less irritating on your throat, at this strength it would still be quite uncomfortable.

Settings matter: Airflow, wattage and vaping style affect nicotine delivery. Stay within the recommended power range of your coil; going over will result in burnt out coils and/or leaking.

Signs your nicotine strength is wrong

Signs it may be too high

Nausea, dizziness, headache, feeling shaky or an unusually rapid heartbeat after vaping can indicate excessive nicotine consumption. Seek medical advice for persistent or worrying symptoms; use NHS 111 for urgent guidance. For severe symptoms, follow NHS poisoning advice. E-liquid swallowed by a child requires urgent assessment.

Signs it may be too low

Persistent cravings, irritability, difficulty concentrating or returning to smoking may mean your nicotine needs are not being met. Check the pod, liquid compatibility and your technique before increasing strength. A Stop Smoking adviser can help. A harsh throat sensation is not always a sign of excessive nicotine. Dry coils, unsuitable liquids and excessive power can also cause irritation. Likewise, smooth vapour does not mean a liquid contains little nicotine.

How to reduce nicotine

You do not have to reduce nicotine immediately after quitting smoking. Staying smoke-free takes priority. When you feel settled and want to reduce usage, consider gradual changes rather than an abrupt drop that prompts heavier vaping or a return to smoking.

A recommended progression in a compatible low-power kit is 20mg → 10mg → 5–6mg → 3mg → 0mg. There is no fixed timetable. Stay at each strength until your cravings are manageable. Increased vaping may mean you have reduced too quickly. The NHS guide to quitting vaping suggests increasing the time between vaping sessions and establishing vape-free periods. 

Nicotine shots and shortfill e-liquids

A shortfill is a larger bottle supplied with nicotine-free flavoured liquid and space to add a nicotine shot. For example, adding one 10ml, 18mg/ml nicotine shot to 50ml of 0mg liquid produces 60ml at 3mg/ml, assuming the liquids mix evenly. Two identical shots added to 100ml produces 120ml at the same 3mg/ml strength.

Nic shots can contain freebase nicotine or salts. Final strength depends on nicotine quantity and total volume. Use the E-liquid Calculator to figure out your mixes. Most high-VG shortfills suit compatible higher-power devices rather than small MTL pods. For ready-to-use e-liquids, browse 10ml e-liquids.

UK nicotine limits and Vaping Products Duty in 2026

Under UK rules, nicotine e-liquids cannot exceed 20mg/ml (2%); nicotine-containing refill bottles are limited to 10ml, and the capacity of refillable vape tanks is limited to 2ml. 

Since 1 October 2026, Vaping Products Duty has been £2.20 per 10ml of vaping liquid, including nicotine-free liquid. A 10ml bottle at 3mg attracts the same volume-based duty as a 10ml bottle at 20mg. Liable businesses pay the duty, which may affect retail prices. VAT is separate. Shortfills and nic shots are included in the duty. See HMRC's guidance.

Shop by strength: e-liquids to compare

• 5mg, 10mg or 20mg nic salt: Bar Juice 5000 Grape Blueberry Ice 
• 10mg or 20mg nic salt: IVG Intense Vanilla Biscuit 10ml
• Nicotine-free mixing option: Doozy Seriously Fusionz Fantasia Grape 100ml Shortfill. Add only compatible nicotine shots and calculate the final strength first.

Check current strength options, stock and compatibility before buying. Nicotine is addictive. Vaping is for adults who smoke or already use nicotine, not children or non-smokers. For help quitting smoking, contact your local NHS Stop Smoking Service

Frequently asked questions

What nicotine strength should a beginner start on?

An adult switching from cigarettes should start by considering smoking frequency, dependence and the chosen device. A small MTL pod commonly uses 10mg or 20mg nicotine salts, but lighter smokers may prefer less. 

Is 20mg nicotine too strong?

It can be, particularly for light smokers or powerful devices. It is the UK's maximum permitted e-liquid concentration, not a recommended target. A 20mg liquid may be useful for some highly dependent smokers using suitable low-power equipment.

What strength works in a sub-ohm tank versus a pod kit?

Higher-power sub-ohm tanks generally use lower strength liquid, often 0–3mg or suitable 6mg freebase. Lower-power MTL pods commonly use higher strengths. 

Is 10mg nicotine salt the same as 10mg freebase?

Both contain 10mg nicotine per millilitre. They can feel different in the throat, and nicotine delivery varies between devices and mixes. The label does not by itself tell you how much nicotine you will get with each puff.

What are the signs my nicotine strength is too high?

Dizziness, nausea, headache or a racing heartbeat after vaping can suggest excessive exposure. Stop using the product and seek medical advice if necessary. Severe symptoms or suspected poisoning require urgent help.

Does vape duty change with nicotine strength?

No. Vaping Products Duty is a flat £2.20 per 10ml regardless of whether the liquid contains 0mg, 10mg or 20mg nicotine. The final selling prices of different products can still vary.