what does vaping do to your lungs

July 7, 2026

What Does Vaping Do to Your Lungs?

The current evidence on vaping and lung health and how it compares to smoking.

Quick answer: Vaping can cause mild airway irritation in some people, but it does not produce the tar, carbon monoxide or combustion carcinogens that cause serious smoking-related lung diseases such as COPD, emphysema and lung cancer. For smokers who switch, lung function typically improves. Long-term effects of vaping specifically are still being studied.

The lungs are the primary site of exposure in vaping, so understanding what is happening there is central to understanding the risks. The picture is substantially more reassuring than for smoking, but it is not entirely without nuance.

Known Effects of Vaping on the Lungs

Effect	What happens	Severity compared to smoking
Airway irritation	PG and some flavourings can mildly irritate the upper airways	Much lower: no tar or combustion compounds
Coughing on starting	Very common in new vapers as airways adjust	Usually temporary; resolves within days to weeks
Reduced cough for ex-smokers	Cilia in airways begin to recover; mucus clearance improves	Improvement: removal of combustion products allows recovery
Increased airway secretions	Some vapers report increased mucus production initially	Temporary: often represents lungs clearing after smoking
COPD / emphysema	No evidence of vaping causing these conditions	Far lower: tar and smoke are responsible for COPD
Lung cancer	No established causal link from vaping	Substantially lower: no combustion carcinogens

What Smoking Does to the Lungs (Comparison)

Understanding why vaping is less harmful requires understanding what smoking actually does. Cigarette smoke contains tar: a sticky black substance that coats lung tissue, narrows airways and contains concentrated carcinogens. Carbon monoxide binds to haemoglobin and reduces oxygen delivery. The cilia (tiny hair-like structures that sweep debris out of the airways) are paralysed by tobacco smoke, leading to the build-up of tar and debris. This causes chronic bronchitis, COPD, emphysema and dramatically increases lung cancer risk.

Vaping produces none of these. No tar, no CO, no cilia paralysis from combustion products. The aerosol from vaping is physically and chemically a fundamentally different substance from tobacco smoke.

Lung health impact: cigarettes vs vaping (approximate, relative)

Longer bar = greater overall harm to lung tissue with prolonged use.

Long-term smoking

Severe

Long-term vaping

Much lower*

Neither

Lowest

* Long-term vaping data is still limited. The bar reflects current evidence trajectory rather than confirmed long-term outcome data.

What Happens to the Lungs When You Switch from Smoking to Vaping?

The recovery process begins rapidly once smoking stops. Within days to weeks, cilia start recovering and begin clearing accumulated debris from the airways. Many ex-smokers who switch to vaping notice a reduction in the chronic cough associated with smoking within the first few weeks. Breathlessness during exercise often improves noticeably within one to three months as lung function recovers.

The early increase in coughing and mucus that some people experience when switching is actually a sign of recovery: the cilia are working again and clearing what smoking left behind.

If you have respiratory symptoms: Persistent cough, shortness of breath, wheezing or chest tightness should always be assessed by a GP: whether you vape, smoke or do neither. Do not attribute respiratory symptoms to vaping without medical assessment, as they may indicate a separate condition that needs treatment.

Frequently Asked Questions

There is no current evidence that vaping causes COPD. COPD is caused primarily by the tar and combustion particles in tobacco smoke destroying lung tissue over decades. Vaping does not produce these substances. For people who already have COPD from smoking, switching to vaping removes further combustion damage, though the condition itself cannot be reversed.

Partially, yes. The lungs have a remarkable ability to recover once the source of damage is removed. Cilia recover, airway inflammation reduces and lung function typically improves. However, significant structural damage from long-term smoking: such as emphysema: cannot be fully reversed. Switching sooner is better than switching later, and switching is better than continuing to smoke.

Vaping is generally less harmful to the airways than smoking, but people with asthma should exercise caution. PG can act as an airway irritant in some individuals, and any inhaled substance has the potential to trigger symptoms in asthma sufferers. If you have asthma and vape, discuss it with your GP or respiratory specialist, particularly if you notice any worsening of symptoms.

This is a common experience when switching and is partly counterintuitive. Smoking paralyses the cilia in the airways. When you switch to vaping, the cilia recover and start working again: this causes increased mucus clearance and coughing as the airways clear. It is a sign of recovery rather than damage. This adjustment cough typically resolves within a few weeks.

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