Does Vaping Impact Lung Capacity?
A clear, balanced UK guide to whether vaping affects lung capacity, what the research shows so far and how it compares to smoking.
The short answer
Unclear so far. Standard lung capacity measures show little change, though airway resistance can rise.
The catch
Vapes are new, so long term effects on the lungs are not yet known.
Vs smoking
Far less harmful than smoking, though that does not mean harmless.
Does vaping impact lung capacity?
The evidence is mixed and still emerging. The best reviews so far suggest vaping increases airway resistance but does not clearly reduce standard lung capacity, at least in the short term. That said, vapes are relatively new, so the long term picture is not yet known.
This is a topic where it is easy to overstate the case in either direction. Vaping is not the harmless water vapour it is sometimes pictured as, yet the headline lung capacity measures have not shifted much in the research to date. This page lays out what is known and what is still uncertain.
Let us look at what the research shows, the concerns that remain and how vaping compares to smoking.
It helps to know what lung capacity actually means. Tests like forced vital capacity measure how much air you can move and how fast, so they are the standard way doctors gauge lung function, so they are a sensible place to start when asking whether vaping does harm.
What the research shows
The clearest evidence so far comes from reviews of lung function tests.
- Capacity measures: standard tests like FEV1 and FVC show little clear change from vaping so far.
- Airway resistance: studies do show vaping can raise airway resistance, making airflow harder.
- Inflammation: aerosol can irritate lung tissue and trigger inflammation and oxidative stress.
- Small studies: most research is short term with few people, so firm conclusions are limited.
The nuance really matters here. A 2022 systematic review found vaping raised airway resistance without clearly changing lung capacity scores, which means breathing can feel harder even when the big capacity numbers look stable, so the absence of a capacity drop is not a clean bill of health.
It is also worth being honest about the limits of the data. Most of the studies involved small numbers of people over short periods, while some lumped current smokers in with non smokers, which muddies the comparison. That is why researchers keep calling for larger, longer studies before drawing firm conclusions.
What the evidence suggests so far
Illustrative summary, not exact data.
The concerns that remain
A stable capacity score is reassuring though it is certainly not the whole story. Vaping can irritate the airways, trigger inflammation and affect the tiny hairs that clear mucus, which may well matter more over the years than a single lung test can capture today. The honest position is simply that we do not yet know the full long term effects.
Some people who vape report wheezing or coughing, while clinicians have seen measurable dips in lung function in some cases, much of which may improve if vaping stops. Because vapes have only been in widespread use for a relatively short time, the picture for decades of use simply does not exist yet, which is a real reason for caution rather than complacency.
There is also early evidence that vaping can hamper the lungs' natural cleaning system and may make the airways more reactive to irritants. None of this proves long term harm on its own, though together it suggests the lungs are not simply indifferent to vapour.
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How it compares to smoking
The comparison with smoking is important here. Smoking is a leading cause of reduced lung capacity and diseases like COPD, because burning tobacco fills the lungs with tar, carbon monoxide and thousands of other chemicals. Vaping involves no combustion at all, so it avoids much of that heavy load.
This is why vaping is considered far less harmful than smoking and why switching fully tends to help a smoker's lungs. The key word there is fully, since using both at once is the worst of both worlds. For a non smoker though, taking up vaping only adds risk to the lungs for no benefit, so it is best not to start at all.
- If you smoke: switching fully to vaping reduces the heavy load on your lungs.
- If you do not smoke: do not start, since vaping is not risk free for the lungs.
- Avoid dual use: vaping and smoking together is the worst option.
- See a doctor: any breathlessness, wheezing or persistent cough deserves a check.
Does nicotine free vaping affect lung capacity?
It is tempting to assume a 0mg vape is automatically fine for the lungs, though the picture is not that simple. Much of the airway irritation and inflammation seen in studies comes from the aerosol and flavourings rather than the nicotine itself, so a nicotine free vape is not guaranteed to be neutral for your lungs.
What going nicotine free does remove is the addictive pull of nicotine and its effects elsewhere in the body. For the lungs specifically though, you are still inhaling heated vapour and a mix of flavour chemicals, which the lungs were never really designed to handle, so the safest position for a non smoker remains not vaping at all.
If you want to dig deeper, see our explainer on what vaping does to your lungs. It pairs well with our guide on whether vaping affects cardio and our look at whether vaping can trigger asthma symptoms.
For the full set of guides, the vaping and health hub brings everything together in one place.
The bottom line: the evidence is mixed. Standard lung capacity measures show little clear change from vaping so far, though airway resistance can rise and the aerosol can irritate and inflame the lungs. Vapes are new, so long term effects are unknown. Vaping is far less harmful than smoking but not harmless, so if you do not smoke, do not start.
Looking after your lungs?
Explore nicotine salts in a range of strengths, including 0mg, with fast UK delivery. You can also speak to the Vape Chaos team, plus a doctor for any breathing concerns.
Frequently asked questions
Does vaping reduce lung capacity?
The evidence is mixed. The best reviews so far suggest vaping does not clearly reduce standard lung capacity measures like FEV1 and FVC, at least short term, though it can raise airway resistance and irritate the lungs. Vapes are new, so the long term picture is not yet known.
What does the research actually say?
A 2022 systematic review found that vaping raised airway resistance without clearly changing lung capacity scores. So breathing can feel harder even when the big capacity numbers themselves look stable. Most studies are small and short term though, so firm long term conclusions cannot yet be drawn.
If capacity looks stable, is vaping safe for my lungs?
Not necessarily. A stable capacity score is reassuring but not the whole story, since vaping can still irritate the airways, trigger inflammation and affect mucus clearance. These effects may matter more over years than a single lung test can capture, so it is not a clean bill of health.
Is vaping worse than smoking for the lungs?
No, it is generally far better. Smoking is a leading cause of reduced lung capacity and diseases like COPD, because burning tobacco fills the lungs with tar and many chemicals. Vaping has no combustion, so it avoids much of that load, which is precisely why switching fully tends to help a smoker.
Will my lungs recover if I stop vaping?
Possibly, at least in part. Some clinicians report that lung function dips seen in vapers can improve after stopping, especially for those who have not vaped for very long. Recovery varies, so any breathlessness, wheezing or persistent cough is worth getting checked by a doctor.
