Nicotine Pouch Side Effects: What the Evidence Says
A new can, a fresh pouch, and ten minutes later your lip is burning and you have the hiccups. Sound familiar? It is one of the most searched questions about pouches in the UK. So we went through what the published research, the NHS and health bodies say, and left out the guesswork.
The short answer: the side effects most often reported with nicotine pouches are mouth and gum irritation, sore or dry mouth, hiccups, nausea, dizziness and headache. They are mostly described as mild in the studies so far, and they show up more at higher strengths. Nicotine is addictive, and the long-term effects of pouches are not yet known.
This guide is general information, not medical advice. If you are worried about a symptom, speak to your GP, a pharmacist or NHS 111.
Nicotine pouch side effects at a glance
Most of what we know comes from small trials and user surveys of people using oral nicotine pouches.
| Side effect | What has been reported |
|---|---|
| Mouth and gum irritation | Sore mouth, white patches or lesions where the pouch sits, gum blisters |
| Dry mouth and sore throat | Reported in surveys and short trials |
| Hiccups | Reported in a UK pouch trial that included VELO and ZYN |
| Nausea and stomach upset | One of the most common complaints in user surveys |
| Dizziness and headache | Short-term effects, more frequent at higher doses |
| Faster heart rate, higher blood pressure | Known short-term effects of nicotine |
| Nicotine dependence | Nicotine is addictive in any form |
Mouth and gum irritation
A tingle or mild burn when a pouch goes in is the nicotine and flavour being released, and both ZYN and VELO describe it in their own UK guidance. Irritation that hangs around after the pouch is out is a different matter.
A 2024 systematic review in BMC Oral Health pulled together the research on pouches and oral health. In a US survey of 118 users, 48% reported mouth lesions and 37% a sore mouth. A small Latvian study found white lesions on the gum in 9 of 12 users, in the spot where the pouch sits. A Swedish study that switched snus users to pouches recorded gum blisters and dry mouth among the side effects.
The reviewers were cautious. All three studies were judged at high risk of bias, with only 190 people in total. Their conclusion: pouches can affect the lining of the mouth and the gums, and longer studies are needed. A cross-sectional study of users in Saudi Arabia also found mouth or gum irritation among the most common complaints.
Hiccups
Hiccups are one of the side effects people ask about most, and there is a little trial evidence behind them. A UK study run in Belfast in 2022 compared several pouches, including VELO and ZYN, in 31 adult smokers. According to the NHS Health Research Authority summary, one participant had hiccups, belching and nausea that investigators linked to the products. All of the reactions recorded were mild. The study was funded by Philip Morris, which owns ZYN.
Hiccups are also a known effect of other nicotine products used in the mouth. The patient leaflet for Nicorette gum warns that chewing too fast can irritate the throat, upset the stomach or give you hiccups. Nobody has measured how often pouch users get them.
Nausea, dizziness and headache
A 2025 review of randomised trials in the journal Addiction looked at seven studies with 269 adults. Side effects were mostly mild, such as cough, throat irritation and headache, and they were more frequent at higher pouch strengths. No serious adverse events were reported. A 2025 narrative review in Frontiers in Public Health lists dizziness, nausea, headaches and mouth irritation among the short-term effects.
Stomach complaints come up in surveys too. In a 2025 survey of pouch users in Saudi Arabia, most respondents reported at least one gut symptom, mainly bloating, nausea and heartburn. A survey cannot show the pouches caused them.
If a pouch makes you feel sick or light-headed, take it out. The feeling usually means the dose was too much for you. Our nicotine pouch strength guide explains how the mg figures compare.
Heart rate and blood pressure
Nicotine raises heart rate and blood pressure in the short term. The Frontiers review lists both as immediate effects of pouch use and notes that sustained nicotine exposure can strain the heart and blood vessels. The World Health Organization says plainly that nicotine use increases cardiovascular risk. If you have a heart condition, talk to your GP before using any nicotine product.
Nicotine dependence
This is the side effect people mention least and the one that lasts longest. All nicotine pouches contain nicotine, and the WHO describes nicotine itself as highly addictive, whether it comes from smoking or vaping or a pouch. Both ZYN's UK site and VELO's own UK guide carry the same warning: the product contains nicotine, which is addictive, and is not risk free.
Dependence shows itself when you stop. The NHS lists the common withdrawal symptoms as cravings, trouble concentrating, restlessness, poor sleep, irritability and low mood. The NHS page is written for people who stop smoking, but these are symptoms of nicotine withdrawal, and NSW Health describes the same pattern. If you want to quit nicotine or stop using nicotine pouches, our guide to quitting nicotine pouches covers what to expect.
Nicotine pouches are for adults aged 18 and over. If you don't already use nicotine, don't start.
Pouches vs other nicotine products
Nicotine pouches are tobacco-free. The WHO describes them as sachets containing nicotine, flavourings, sweeteners and other additives, placed between the gum and lip. Unlike snus and other smokeless tobacco products, there is no tobacco leaf inside, and unlike cigarette smoking there is nothing combustible. Our snus vs nicotine pouches guide covers the differences.
That changes what is in the pouch, not the nicotine. Many of the side effects above overlap with those listed for nicotine replacement therapy. NHS Highland lists headache, nausea and dizziness as common to all nicotine replacement products, and nicotine gum carries a hiccups warning. Pouches are not licensed as a stop smoking aid, and the Cochrane review mentioned below found limited evidence on smoking cessation. If you smoke and want to stop smoking, the NHS Quit Smoking pages have a free Personal Quit Plan.
Does strength make a difference?
Yes. The amount of nicotine matters more than the brand. The trial review in Addiction found side effects became more frequent as the dose went up. Germany's Federal Institute for Risk Assessment (BfR) focuses its risk assessment on high nicotine content and has set a level above which it considers a pouch acutely toxic. The WHO has flagged products labelled with up to 150mg of nicotine.
Nicotine strength labels vary between brands, so read the milligrams of nicotine per pouch on the can rather than going by words like "strong" or "extreme".
VELO side effects and ZYN side effects
There is no good evidence that VELO or ZYN cause different side effects from other pouches. Both deliver nicotine through the gum in the same way. The Belfast trial above tested both but did not split side effects by brand.
One point that often gets misread: in January 2025 the US FDA authorised 20 ZYN products for sale in the US. The FDA stressed that this is not an approval and does not mean the products are free of risk. You can compare the two brands in our ZYN vs VELO guide or read what ZYN is.
What about long-term effects?
They are not known. Pouches are a relatively new product, and the research has not caught up. A Cochrane review published in October 2025 found only four small studies and described its confidence in the evidence as little to very low. The Frontiers review reaches the same place: the long-term health effects are still unknown, and few of the studies are independent of industry funding.
We cover the wider risk question in our guide to the risks of nicotine pouches.
Keep pouches away from children and pets
Swallowed pouches are a poisoning risk for children. The BfR reports cases of pouch poisoning reaching German poison centres since 2020, with symptoms such as nausea, vomiting and diarrhoea, and in severe cases a slowed heartbeat or breathing problems. America's Poison Control lists similar symptoms and notes they can begin within minutes.
Store cans out of reach and put used pouches in the lid compartment or a bin, never loose on a table. If a child may have swallowed a pouch, the NHS advice is to call 999 or go to A&E. Dog owners should read our guide to nicotine and dogs.
When to speak to a doctor or pharmacist
Get advice from your GP, a pharmacist or a dentist if:
- a mouth ulcer or sore patch lasts longer than three weeks, bleeds, or gets more painful and red (NHS mouth ulcer guidance)
- you notice white patches or changes in your gums that don't clear up
- nausea, dizziness, headaches or a racing heart keep coming back
- you have a heart condition or other medical condition, or you are pregnant or breastfeeding. VELO's UK guidance tells these groups to consult a doctor first
- you feel unable to control how much you use, or want help cutting down
If someone loses consciousness, has a seizure, or a child may have swallowed a pouch, the NHS advice is to call 999.
FAQs
Do nicotine pouches have side effects?
Yes. Mouth and gum irritation, hiccups, nausea, dizziness and headache are the most reported, and nicotine is addictive. Long-term effects are unknown.
Can nicotine pouches make you feel sick?
They can. Nausea is one of the most common complaints in user surveys, and it is more likely with stronger pouches or if you are new to nicotine. Take the pouch out if you feel sick, and consider a lower strength.
Why do nicotine pouches give me hiccups?
Hiccups have been recorded in pouch trials and are a known effect of nicotine gum too. Researchers have not pinned down the exact cause, or how common they are with pouches. If they bother you, a lower strength or a shorter time with the pouch in may help.
Do nicotine pouches cause gum disease?
There is not enough evidence to say. Studies have found lesions and irritation where the pouch sits, but the research is small and at high risk of bias. If you notice gum changes that don't clear up, see a dentist.
Is 2 nicotine pouches a day bad?
We can't tell you that any amount is free of risk, because nobody knows that yet. What we can say is that any regular nicotine use can lead to dependence. Follow the warnings on the can, and see our guide on how to use nicotine pouches for what the manufacturers say about daily use.
Nicotine pouches are for adults aged 18 and over, and nicotine is addictive. If you already use nicotine and want to find a strength that suits you, browse our full range, where every can lists its mg per pouch.
