RESEARCH ALERT
Some vapes use added chemicals to create a cold or icy feeling. New research has raised concerns about three of them: WS-23, WS-3 and WS-5. We do not yet know how common they are in Wales.
Information / Second-hand vaping
Second-hand vaping & passive vape aerosol
Vaping does not produce tobacco smoke, so the established harms of second-hand cigarette smoke do not apply in the same way. The current evidence suggests the risk to bystanders from vape aerosol is low, but that does not mean every setting should ignore it.
Last reviewed: 25th September 2026
QUICK ANSWER
Passive vaping is not the same as passive smoking.
ASH says current evidence suggests short-term exposure to vape aerosol is not harmful to health, although regular indoor exposure over long periods could carry some low-level risk. Any potential risk is likely to be significantly lower than the proven harms from second-hand tobacco smoke.
What does a bystander breathe in?
A person who vapes exhales an aerosol rather than tobacco smoke. It can contain small amounts of nicotine and other substances from the e-liquid and heating process.
Because there is no burning tobacco, bystanders are not exposed to the same mixture of tar, carbon monoxide and combustion products found in cigarette smoke.
What does the evidence say?
Short-term exposure
Current evidence suggests short-term exposure to second-hand vape aerosol is unlikely to cause harm.
Longer indoor exposure
Evidence is more limited. Regular exposure to vaping indoors for long periods may carry some low-level risk.
Compared with smoking
Any potential risk from passive vaping is likely to be much lower than the well-established risks of passive cigarette smoke.
What about babies and children?
The NHS advises avoiding vaping around babies and children where possible as a precaution. Young children may also copy adult behaviour.
That precaution should not be used to suggest that vaping around someone is equivalent to smoking around them. If an adult smokes, switching completely away from cigarettes remains an important health gain.
Schools, homes and shared spaces
Organisations can set rules about where vaping is allowed. Schools should follow their own vaping policy and safeguarding procedures. In homes or shared spaces, it is reasonable to avoid vaping close to other people who do not want to be exposed, particularly babies, children and people who find aerosols irritating.
For schools
Practical guidance for responding to vaping without confusing it with smoking.
Second-hand smoke
The evidence on passive smoking is very different and much stronger.
If you smoke and are worried about other people
The priority is to remove cigarette smoke exposure. Smoking outside reduces exposure indoors, but stopping smoking altogether gives the greatest protection. If vaping helps an adult switch completely away from cigarettes, that is substantially less harmful than continuing to smoke.
Sources & further reading
ASH
Current evidence summary on second-hand vaping and how it compares with passive smoking.
NHS
NHS advice on passive vaping, children and comparison with tobacco smoke.
LATEST
Latest updates on this topic
2 October 2026
New Welsh report highlights confusion over vaping harms as duty begins
More than half of Welsh adults who have heard of vapes wrongly believe vaping is as harmful as smoking or worse, new ASH Wales…
Read update1 October 2026
New vaping duty comes into force across Wales today
A new UK excise duty on vaping products starts today, 1 October 2026. Here is what the £2.20 per 10ml duty, new vape duty…
Read update25 September 2026
Youth smoking and vaping in Wales: what the latest 2025 data tells us
New 2025 SHRN data shows regular vaping and smoking have fallen among secondary school learners in Wales. We look at the latest figures, what…
Read update

