A nicotine-free vape (often labelled 0mg or “zero nic”) is an e-cigarette product that contains no nicotine, but still delivers vapour by heating an e-liquid base of propylene glycol (PG), vegetable glycerine (VG) and food-grade flavourings. Under UK TPD rules these products are still notified to the MHRA, capped at 2ml per pod, and subject to the same banned-ingredient list as nicotine-containing vapes.

The NHS and Cancer Research UK consistently describe all TPD-compliant vapes (including 0mg) as far less harmful than smoking because there is no combustion, no tar and no carbon monoxide. The Public Health England headline figure of “around 95% less harmful than smoking” applies to vapes generally, including nicotine-free versions. The reason is structural: smoke from a cigarette contains thousands of toxic combustion products, vapour from an e-cigarette does not.

However, “less harmful than smoking” is not the same as “safe”. Even without nicotine, the inhaled vapour still contains heated PG, VG and flavouring compounds. Some lab studies (notably from Anglia Ruskin University in 2024) showed that even 0mg vapes can cause measurable airway inflammation and oxidative stress in cell models. We do not yet have long-term human studies. The NHS does not recommend vaping in any form for people who have never smoked, even at 0mg.

What is actually in a 0mg vape

Four ingredients: propylene glycol (PG, a flavour carrier), vegetable glycerine (VG, a vapour producer), food-grade flavourings, and water. There is no nicotine. All ingredients must be listed on the packaging under UK TPD rules. Diacetyl (the chemical historically associated with popcorn lung in industrial settings) is banned from all UK e-liquids including 0mg ones. Compared with a nicotine-containing vape, the only difference is the absence of nicotine; the carrier liquid and flavour profile are otherwise the same.

Why 0mg is not the same as risk-free

Three reasons. First, inhaling heated PG and VG over long periods can irritate the throat and airways. Some users report mild cough or dryness when starting out. Second, flavouring compounds (especially fruity or sweet flavours) have not been individually tested for long-term safe inhalation; they are food-grade, not lung-grade. Third, the act of vaping itself is habit-forming behaviourally even without chemical addiction, particularly for ex-smokers who associate the physical routine with cravings. Studies suggest oxidative stress can occur in lung cells exposed to 0mg vapour, though the practical health significance in humans is still being researched.

Who 0mg vapes actually suit

Three groups benefit most. Ex-smokers who have already stepped down from 20mg/ml or 10mg/ml nic salts and want to maintain the physical routine while removing the chemical dependency entirely. Pregnant or breastfeeding ex-smokers who want a smoking alternative without nicotine (though current NHS advice is to avoid vaping during pregnancy where possible). And anyone using vaping purely as a hand-to-mouth replacement habit rather than for nicotine satisfaction. The NHS is clear that 0mg vapes are not recommended for non-smokers, anyone under 18, or anyone who has never used nicotine products.

Across our Omagh and Strabane stores, the most common 0mg question is “is this actually going to help me, or am I just swapping one habit for another”. Below is the framework we use, based on a decade helping smokers transition.

If you are unsure whether 0mg is right for your situation, the simplest step is to talk to your GP or NHS Stop Smoking Service. They can advise on whether vaping (including 0mg) fits your wider quit plan or whether other nicotine replacement therapies might suit better. Our Omagh and Strabane teams are happy to discuss the practical day-to-day experience of using 0mg products, but for clinical advice your healthcare provider is the right starting point.