Do vapes have calories?
By the OffPuff team · September 14, 2026
The short answer
Technically yes and practically no. The liquid in a vape is mostly vegetable glycerin and propylene glycol, and glycerin is assigned about 4 calories per gram on food labels. But you don't eat e-liquid - you inhale an aerosol, and almost none of it is digested. No study has ever measured a meaningful "calories absorbed per puff" number, because the amount is too small to matter. If you're counting calories, your vape is not the line item to worry about.
Why the question exists at all
It's a fair question, because the math looks real on paper. Say someone vapes 2 ml of liquid in a day - a heavy day for most people. If that liquid were pure glycerin and you drank it, food-label math says that's around 10 calories: less than a single plain cracker. (That arithmetic is illustrative, not a measurement - real liquids are glycerin, propylene glycol, flavorings and nicotine in varying mixes, and nobody has measured how much energy a vaper actually absorbs.)
And absorption is the whole point. Food calories count because your digestive system breaks food down and takes the energy in. Inhaled aerosol mostly coats your airways and gets exhaled or cleared; very little reaches your digestive system at all. The honest answer to "how many calories am I absorbing from vaping" is: nobody has published a real number, and every researcher who has looked at it treats it as negligible.
So why do people say vaping keeps them thin?
Because the appetite effect is real - it just has nothing to do with calories. Nicotine is a documented appetite suppressant: a 2021 review in Pharmacology & Therapeutics describes its marked anorectic action and its effects on energy expenditure. Smokers genuinely do weigh less than non-smokers on average, and this is most of why. If vaping seems to "work" for weight, nicotine's appetite suppression is the mechanism - the same mechanism cigarettes have, with the same addiction attached.
Which leads to the number that matters if you're thinking about quitting: a meta-analysis of 62 studies found that people who quit nicotine gain an average of about 4-5 kg (roughly 10 pounds) over the following year - with a wide spread: about 16% of quitters actually lost weight, while 13% gained more than 10 kg. Appetite coming back is your body un-suppressing itself. It's normal, it's mostly front-loaded in the first three months, and it is manageable with ordinary habits. What it is not is a reason to keep vaping.
Is vaping a weight-loss tool?
No, and it's worth being plain about why. Using nicotine for appetite control means trading a manageable eating question for an addiction that costs money every week and carries its own health unknowns. No health authority endorses vaping for weight control. If fear of gaining weight is the thing keeping you from quitting, that's worth saying out loud to a doctor - it's one of the most common and most solvable barriers to quitting there is, and there are better tools for it than a vape.
One honest note
OffPuff is a quit-vaping app in development - it doesn't exist yet, and nothing in this article depends on it. We wrote this because this question gets tens of thousands of searches a month and the answers ranking today are mostly written by companies selling vapes. You deserved one that isn't.
Sources
- Aubin HJ et al., "Weight gain in smokers after quitting cigarettes: meta-analysis," BMJ 2012 (via PubMed)
- "Nicotine's actions on energy balance: Friend or foe?", Pharmacology & Therapeutics 2021
- Do Vapes Have Calories? (AIRIS guide - industry explainer used for the food-label framing of glycerin/PG calories)
How this was written: researched against the sources above, drafted with AI assistance, and reviewed by the OffPuff founder before publication. We are not doctors, and this is not medical advice - if weight or appetite is part of your quit decision, a doctor can help you plan for it directly.