Nicotine is a well-documented appetite suppressant. Research dating back decades on cigarette smoking, and more recent research on vaping specifically, consistently shows that nicotine reduces hunger and slightly increases metabolic rate. A 2021 research review found nicotine helps reduce appetite and food intake by affecting neuropeptide Y (NPY) and pro-opiomelanocortin (POMC) signalling in the brain. A 2022 review found nicotine increases resting metabolic rate by around 50 calories per day. For these reasons, vaping is more likely to be associated with weight maintenance or mild weight loss than with weight gain.

E-liquid itself contains negligible calories. The four ingredients (PG, VG, nicotine, flavourings, water) total fewer than 5 calories per ml, and that 2ml pod lasts most users 1-3 days. The act of vaping does not meaningfully add to calorie intake. The hand-to-mouth habit of vaping may actually substitute for snacking behaviour, reducing total calorie intake compared with someone using food to fill the same psychological need.

Where weight gain does happen is when people quit nicotine. The appetite-suppressing effects reverse, the slight metabolic boost reverses, and former smokers and vapers often experience increased hunger and snacking. NHS Stop Smoking Services specifically address weight gain as a known issue when quitting smoking, with the typical gain being 2-5kg over the first year. The same pattern affects vapers who stop. This is not a reason to keep vaping: NHS data confirms that the health benefits of stopping nicotine vastly outweigh modest weight gain, which can be managed with dietary attention and exercise.

Why nicotine specifically suppresses appetite

Nicotine acts on the hypothalamus, the brain region that controls hunger and satiety. Specifically, it stimulates POMC (pro-opiomelanocortin) neurons which release alpha-MSH, a hormone that reduces hunger. Nicotine also affects NPY (neuropeptide Y), which is involved in hunger signalling. The combined effect is reduced appetite and reduced food intake. Additionally, nicotine slightly increases sympathetic nervous system activity, raising heart rate, body temperature and resting metabolic rate by around 50 calories per day. The metabolic boost is small but real, and is part of why cigarette smokers historically weighed less on average than non-smokers.

When weight gain happens around vaping

Three scenarios. First and most common: stopping vaping or stepping down nicotine reverses appetite suppression. People often gain 2-5kg in the first year after quitting. Second: some vapers use sweet or fruit flavours and find the flavour triggers food cravings, increasing snacking around vape sessions. Third: ex-smokers who switch to vaping rather than quitting nicotine entirely usually do not gain weight, because nicotine intake is maintained. The pattern is clear: nicotine maintains weight or reduces it slightly; lack of nicotine after dependence allows weight to return to natural baseline.

Why vaping is not recommended as a weight loss strategy

The NHS, Cancer Research UK and Public Health England all explicitly recommend against using vaping or smoking for weight management. Reasons. First, nicotine addiction creates a long-term dependency that is hard to break, with all the associated cardiovascular and respiratory risks. Second, the appetite suppression effect is modest (a few hundred calories per day at most) and easily achievable through normal dietary attention. Third, weight gain on quitting is temporary and manageable; nicotine dependency lasts decades. Fourth, the health risks of nicotine use vastly exceed the health risks of being a few kg heavier. For weight management, NHS guidance recommends balanced diet, regular exercise and (if needed) talking to your GP about evidence-based weight loss support.

For UK vapers considering stopping who are worried about weight gain, the four-step framework below is the standard NHS Stop Smoking Service approach.

The NHS, Cancer Research UK and Public Health England all explicitly recommend against using vaping or smoking for weight management. The health benefits of stopping nicotine vastly outweigh modest temporary weight gain. If you are struggling with weight gain after quitting, talk to your GP about evidence-based weight management options including NHS dietitian referral, weight management programmes and (where appropriate) GP-prescribed weight management medications.