What is nicotine salt, and why do most UK pod kits use 20mg?

Nicotine salt is nicotine that has been combined with a mild acid, such as benzoic acid, so it feels smoother to inhale than traditional freebase nicotine. That smoothness is why it suits small pod kits at higher strengths. Twenty milligrams per millilitre (20mg/ml, or 2%) is also the highest strength UK law allows, so many pod kits sit right at that limit.

Take the Hayati Pro Max+ 4000 Prefilled Pods as an everyday example. Its listing gives 20mg/ml (2%) nic salt, a 1.5ml pod and a mesh coil. This guide explains what those terms mean, why the strength is so common and what to know before you choose.

How is nicotine turned into a salt?

Nicotine is a weak base. In its natural, freebase form it can feel harsh and bitter in the throat, especially at higher strengths. To change that, makers add an organic acid such as benzoic or lactic acid. The acid lowers the pH of the liquid and turns most of the nicotine into a protonated form, which is what people call a salt.

The UK Committee on Toxicity looked at this in a 2021 statement. It noted that the MHRA had already listed over a thousand notified products containing a nicotine salt, and that most of the nicotine in these products is in the salt form, not freebase.

How is it different from freebase nicotine?

The difference comes down to chemistry, and it changes how a vape feels.

•  pH: freebase liquids are more alkaline, while salt liquids are closer to neutral or slightly acidic 

•  Harshness: salts are generally reported to be smoother and less bitter when inhaled 

•  Strength used: salts let makers use higher strengths without the throat feeling too rough 

•  Device type: they suit small pod kits with compact batteries, where a gentle, steady draw works best

A 2021 trial published in JAMA Network Open compared the two. The salt versions were rated as smoother and less harsh than freebase versions at the same nicotine level.

Why does nicotine salt feel smoother?

Alkaline freebase nicotine can irritate the throat, which is why older vape liquids were made at lower strengths. Lowering the pH takes away much of that bite. The nicotine is still there, but it doesn't scratch the throat in the same way.

That's helpful for adult smokers who are switching and want a draw that feels easy. It's worth knowing, though, that smooth doesn't mean mild. We'll come back to that below.

Does smoother mean weaker?

No, and this is the part many people miss. The UK Committee on Toxicity says products with nicotine salts are likely to be linked to higher overall nicotine delivery to users, though it isn't currently possible to put a figure on it. It also warns that products which deliver more nicotine may carry a higher risk of promoting addiction.

The same JAMA trial found that salt versions were more appealing, and that the effect was stronger in people who had never smoked. That's one reason the topic gets so much attention, and why these products are for adult smokers only.

What does 20mg/ml actually mean?

It means there are 20 milligrams of nicotine in every millilitre of liquid. That's the same as 2%. It does not mean you take in 20mg with each puff.

A simple sum shows how much nicotine is in a pod. A 1.5ml pod at 20mg/ml holds about 30mg in total. How much of that you actually absorb depends on how often and how deeply you vape, and on the device, so the number is only a rough guide to what's inside.

Why do so many UK pod kits use 20mg?

There are two main reasons.

•  It's the legal ceiling. GOV.UK guidance says nicotine liquids can be no stronger than 20mg/ml. Many makers choose the top strength for products aimed at adult smokers. 

•  Salts make it tolerable. At 20mg/ml, a freebase liquid would feel very harsh. A salt liquid is much easier to draw on.

I can't say that "most" kits use 20mg, because that depends on the range you look at. What's clear is that it's very common, and it's the strength listed on the Hayati pods page.

Is 20mg a recommendation?

No, it's a maximum. UK law sets an upper limit and doesn't stop lower strengths being sold. If you're an adult smoker switching, the right strength depends on how much you smoke and how you feel on the device. A stop smoking service or a pharmacist can help you work that out.

If you're not used to nicotine, 20mg can feel strong. That's another reason these products aren't for non smokers.

Anyone comparing liquid styles and nicotine strengths across the range can browse the e-liquids at Vape Spot Wholesale and read each label carefully.

What does the Hayati Pro Max+ 4000 pods listing say?

Here are the main details from the listing:

•  Nicotine: 20mg/ml (2%) nic salt, the only strength listed 

•  Pod: 1.5ml, paired with a 5.5ml refill container 

•  Coil: 1.0Ω mesh, mouth to lung style, activated by drawing 

•  Puffs: up to 4,000 plus 

•  Battery: 850mAh with Type C charging and a battery percentage screen 

•  Flavours: 30 blends claimed, plus a Mixed Box 

•  Price: £18.99 for a Box of 5

The page doesn't say which device the pods fit, or whether the box holds pods or complete devices, so check that with the seller before you order. Shops and buyers who like the ready filled format can browse more prefilled pods to compare styles.

Why are salts so common in small devices?

Small pod kits use compact batteries and low power. Salt nicotine suits that, because it stays comfortable to inhale without needing a big, powerful device. A 2021 study makes the same point, describing salts as a good fit for modern pod style devices.

Anyone comparing battery sizes and charging across devices can browse the range of rechargeable vapes to see how they differ.

How do you read a nicotine label?

Check these things on the box or the pod:

•  Strength: shown as mg/ml or as a percentage 

•  Ingredients: the liquid base, flavourings and the type of nicotine 

•  Warnings: the nicotine and age warnings should be clear 

•  Pod size: it should match UK limits 

•  Notification: the product should be on the MHRA list

If a label is missing, unclear or doesn't match the listing, don't use the product and contact the seller.

What UK rules should you check before buying?

GOV.UK guidance says nicotine e-liquids can be no stronger than 20mg/ml, nicotine vape tanks can hold no more than 2ml, and nicotine refill containers can hold no more than 10ml. Products also have to be notified to the MHRA before they can be sold, and nicotine products or their packaging must be child resistant and tamper evident.

Since the single use vape ban on 1 June 2025, a vape also needs a rechargeable battery, a refillable or replaceable pod, a replaceable coil where one is fitted, and refills that are available separately. A rechargeable battery on its own doesn't prove a device is compliant.

The listing's 20mg strength, 1.5ml pod and 5.5ml refill container sit within those limits. The page makes no claim about MHRA notification, so check the packaging and the MHRA list for the exact version you receive.

What should you know about nicotine and health?

Nicotine is addictive, and vaping isn't without risk. The long term effects are still being studied. Smoother doesn't mean milder, and nothing about a nicotine salt removes the health risks. The listing says the product isn't suitable for non smokers, under 18s, or anyone pregnant or breastfeeding, and the site advises against use with cardiovascular disease or seizure disorders.

Some people notice a dry mouth, throat irritation, coughing, headaches or dizziness. If symptoms last, stop using the device and speak to a healthcare professional. Adult smokers who want to quit can ask a stop smoking service for support.

Choosing your next box with confidence

Now that you know what nicotine salt is and why 20mg is so common, you can read a label properly and ask the right questions before you order. Whether you're buying for yourself or stocking a shop, knowing what's in the pod helps you pick sensibly and explain it to customers.

What is the difference between wholesale and retail?

Retail is when you buy one or two items from a shop at the normal shelf price. Wholesale is when you buy in bigger packs, usually boxes, straight from a supplier, so each item costs less. Shops buy this way so they can sell on to customers, and many everyday buyers use it too.

•  Retail: single items, normal shelf price, bought from a shop 

•  Wholesale: boxes or bulk packs, lower price per item, bought from a supplier

Why can buying wholesale work out better?

Buying wholesale can save you money and effort, as long as you'll really use what you buy. Here's why it often works out better:

•  Lower price per device: boxes usually cost less per item than buying one at a time 

•  Fewer orders: one box can cover weeks or months of use 

•  Steady supply for shops: shelves stay stocked without repeat trips 

•  Wider choice: more flavours and brands in one place 

•  Easy to start small: with no minimum order, you don't have to buy a huge amount

Retail still makes sense if you only want to try one flavour. Wholesale tends to win once you know what you like, or when you're stocking a shop.

Why buy from Vape Spot Wholesale

If you'd like genuine stock from a UK supplier that keeps things simple, Vape Spot Wholesale is a trusted wholesale supplier for both shops and everyday buyers. Orders placed before 3pm on a working day are dispatched by 3pm the next working day. You also get TPD compliant products, free delivery over £250 and a 30 day returns policy. You can read what customers say about the shop on Trustpilot.

FAQ section

What is nicotine salt?

It's nicotine combined with a mild acid, such as benzoic acid. This lowers the pH of the liquid and makes it feel smoother to inhale than freebase nicotine.

Is nicotine salt stronger than freebase?

Not at the same strength on the label, but the UK Committee on Toxicity says salt products are likely to deliver more nicotine overall. The exact effect can't be measured yet.

What does 20mg/ml mean?

It means 20 milligrams of nicotine in each millilitre of liquid, which is 2%. It isn't the amount you take in per puff.

Why is 20mg the common top strength in the UK?

It's the legal maximum under GOV.UK guidance, and salt nicotine makes that strength comfortable to inhale.

Is nicotine salt less harmful?

No evidence in the sources used here shows that. Smoother doesn't mean milder, and nicotine salts can still be addictive.

Are there lower strengths?

UK law sets a maximum, so lower strengths are allowed. This listing only offers 20mg/ml.

What strength are the Hayati Pro Max+ 4000 pods?

The listing says 20mg/ml (2%) nic salt.

⚠️ This product contains nicotine, a highly addictive substance, and is intended for adults of legal vaping age (18+) in the UK. It is not suitable for those who do not smoke, pregnant or breastfeeding individuals, or those with heart or respiratory conditions. Keep out of reach of children and pets at all times.