The use of electronic cigarettes (e‐cigarettes), electronic shishas (e‐shishas), and new “smokeless” tobacco products as substitutes for the traditional tobacco cigarette, and as a lifestyle product, has increased significantly in recent years. Several studies showed that the consumption of e‐cigarettes causes the release of undesired substances, which might affect indoor air quality. Therefore, the question now arises whether, analogous to passive smoking, passive vaping also exists.