What is it about?
This systematic review looks at what happens when people breathe in e-cigarette aerosol from someone else’s vaping. Most vaping research focuses on the person using the device. This review shifts attention to bystanders: adolescents, healthy adults, and people with existing lung disease who may be exposed at home, in public places, or in enclosed indoor spaces. We reviewed human studies that measured respiratory symptoms, lung function, airway irritation, inflammation, and indoor air exposure. The evidence base is still small, with only five eligible studies, but the findings point in the same direction. Secondhand e-cigarette aerosol was linked with more bronchitic symptoms, wheeze, shortness of breath, asthma-related outcomes, throat irritation, changes in airway resistance, reduced exhaled nitric oxide in acute exposure studies, and inflammatory biomarker changes in people with COPD. The effects appear less severe than secondhand cigarette smoke, but they are not zero. The main message is that secondhand vaping should not be treated as harmless air.
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Why is it important?
Many people still think e-cigarette aerosol is only “water vapor.” It is not. E-cigarette aerosol can contain nicotine, ultrafine particles, volatile organic compounds, aldehydes, and other chemicals that may irritate or inflame the airways. This matters especially in indoor spaces where non-users, children, adolescents, and people with asthma or COPD may be exposed without choosing it. The review is important because current public policy often lags behind the evidence. Many smoke-free rules were written for cigarettes and do not always include vaping. Our findings support stronger protection against secondhand e-cigarette aerosol, particularly in homes, schools, vehicles, workplaces, and public indoor spaces. The evidence is still developing, so long-term studies are needed. But the available data already challenge the idea that passive exposure to vaping is benign.
Perspectives
This review was written because secondhand vaping is easy to dismiss. Compared with cigarette smoke, e-cigarette aerosol often looks cleaner, smells different, and disappears faster. That can make the exposure feel less serious. But visibility is not the same as safety. What stood out to me was that even short controlled exposures could produce measurable irritation or airway changes, while household exposure studies linked passive vaping with respiratory symptoms in young people. The evidence is not yet large, but it is consistent enough to take seriously. For me, the practical point is simple: people who do not vape should not have to inhale someone else’s aerosol, especially children and people with respiratory disease. Public health policy should treat indoor vaping as an exposure issue, not just a personal choice.
Ardie Barry Sailis
University of Malaya
Read the Original
This page is a summary of: Effects of secondhand exposure to e-cigarette aerosol on lung health: a systematic review, Journal of Public Health, March 2026, Springer Science + Business Media,
DOI: 10.1007/s10389-026-02740-0.
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