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Related Experiment Video

Updated: May 4, 2026

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Secondhand exposure to vapors from electronic cigarettes.

Jan Czogala1, Maciej L Goniewicz, Bartlomiej Fidelus

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Nicotine & Tobacco Research : Official Journal of the Society for Research on Nicotine and Tobacco
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PubMed
Summary

Secondhand exposure to electronic cigarette (e-cigarette) vapor can expose non-users to nicotine. While e-cigarettes do not produce combustion toxicants, nicotine levels are lower than from traditional tobacco cigarettes.

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Area of Science:

  • Environmental Health
  • Toxicology
  • Public Health

Background:

  • Electronic cigarettes (e-cigarettes) produce inhalable aerosol (vapor) containing nicotine.
  • Exhaled mainstream vapor from e-cigarette use can lead to secondhand exposure.
  • Understanding secondhand exposure risks from e-cigarettes is crucial for public health.

Purpose of the Study:

  • To evaluate secondhand exposure to nicotine and other toxicants from e-cigarettes.
  • To compare secondhand exposure from e-cigarettes versus traditional tobacco cigarettes.

Main Methods:

  • Measured airborne markers: nicotine, PM(2.5), carbon monoxide, and VOCs in an exposure chamber.
  • Generated e-cigarette vapor using a smoking machine across three brands.
  • Compared secondhand exposure from e-cigarette vapor and tobacco smoke from dual users.

Main Results:

  • E-cigarettes are a source of secondhand nicotine exposure.
  • Nicotine concentrations from e-cigarettes ranged from 0.82 to 6.23 µg/m³.
  • Secondhand nicotine exposure from e-cigarettes was significantly lower (10 times less) than from tobacco cigarettes (3.32±2.49 µg/m³ vs. 31.60±6.91 µg/m³).

Conclusions:

  • Indoor e-cigarette use involuntarily exposes non-users to nicotine, but not combustion toxicants.
  • Further research is needed on the health impacts of secondhand nicotine exposure, especially for vulnerable groups.
  • Health consequences for children, pregnant women, and individuals with cardiovascular conditions require evaluation.