Do Vapes Have Calories?
A clear UK guide to whether vape liquid has calories, what your body actually absorbs and what it means for diet, fasting and weight goals.
Vape liquid contains calories on paper but you absorb almost none of them.
PG and VG both have a measurable calorie value per gram, similar to sugar at around four calories per gram. The catch is that you inhale rather than swallow them, and the body absorbs only a tiny fraction through the lungs and mouth. Practical calorie intake from vaping is close to zero.
This question gets asked a lot by people who have switched from smoking to vaping and noticed weight changes, or by those tracking calories carefully. The honest answer involves the difference between calories in a substance and calories your body actually uses. The two are not the same thing.
How vape ingredients line up against food
Vape liquid is mostly four ingredients. The grid below covers the calorie picture for each, based on standard nutrition science.
Vegetable glycerine
Around 4.3 calories per gram. A 10ml bottle of high VG liquid contains roughly 35 calories on paper.
⚠ Calories on paperPropylene glycol
Around 4 calories per gram. Lower density than VG so slightly fewer calories per ml.
⚠ Calories on paperFlavourings
Most flavour additives are calorie negligible at the small percentages used in e-liquid.
✓ NegligibleNicotine
Pure nicotine has a calorie value but the amount in 10ml of liquid is too small to matter.
✓ NegligibleWhy inhaled calories are different from eaten calories
Calorie absorption depends on your digestive system. Inhaled compounds bypass it almost entirely. The table below covers what happens to vape calories at each stage.
| Stage | What happens to vape calories |
|---|---|
| Inhaled to lungs | Vapour contains tiny amounts of PG and VG that mostly leave when you exhale |
| Mucous membrane absorption | Some VG absorbed through mouth and lung lining, less than 1 percent of intake |
| Swallowed saliva | A small amount of condensed vapour is swallowed but the volume is tiny |
| Digestive processing | Only the swallowed fraction reaches the stomach where calories can be absorbed |
| Net calorie absorption | Studies estimate well under 5 calories a day for typical vapers |
Should calorie counters track vaping?
Almost universally no. The absorbed calorie figure is so small that tracking it adds noise without adding meaningful information. Your morning cup of black coffee adds more calories than a full day of heavy vaping. Calorie tracking apps like MyFitnessPal do not list e-liquid for this reason.
If you have noticed weight gain after switching from smoking to vaping, the cause is almost never vape calories. The bigger drivers are recovering appetite, returning taste and increased food enjoyment as nicotine related appetite suppression weakens. Our linked guides cover this in detail.
What about VG sweetness and sugar cravings
VG itself is mildly sweet but the amount you taste is tiny. The bigger factor is that some sweet flavoured e-liquids can drive sugar cravings during the day, which leads to higher food intake. The checklist below covers the practical changes that help most.
Vape and diet checklist
Use four or more of these to keep vaping calorie neutral.
- Choose mint, fruit or tobacco flavours over dessert and bakery profiles
- Drink water during long vape sessions to limit sugar cravings
- Keep nicotine strength steady to avoid yo yo appetite changes
- Track food rather than vape liquid for calorie counting purposes
- Avoid stacking sweet vape flavours with sugary drinks like cola
- Plan meals around hunger cues rather than vape sessions
What about diabetics or people on strict diets?
Diabetics specifically sometimes ask whether VG affects blood sugar. The amount absorbed is too small to register on glucose monitors and does not impact insulin requirements. Patients on very low calorie medical diets should still check with their dietitian, but in almost every case vaping is treated as calorie neutral.
Calorie questions often come up alongside wider weight and ingredient queries, which our our guide on whether vapes are vegan covers from a different angle, plus our article on whether vaping makes you fat gives a wider view of vaping and weight in the UK.
Frequently asked questions
How many calories are in a 10ml bottle of vape liquid?
Around 30 to 40 calories on paper. You absorb almost none of them through inhalation.
Will vaping break a diet?
No. Calorie absorption from vape vapour is negligible and does not affect calorie controlled diets.
Is high VG e-liquid worse for calories than high PG?
Slightly more calories per ml on paper but the absorbed amount is still tiny.
Can vape liquid affect blood sugar?
No. Inhaled VG and PG do not raise blood glucose in any clinically meaningful way.
Should diabetics worry about vape calories?
No. Standard diabetic dietary advice does not need to account for vape liquid intake.
Part of our Health Guidance Hub
More clear, honest answers about vaping and your health
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