All published analyzes of the air in steamed rooms show that the concentrations of pollutants are far below the recognized limit values ​​for air quality. This also applies to nicotine, which >95% remains in the body, so only traces of it are exhaled and released into the surrounding air. German authorities regularly claim that inhalation of propylene glycol, a substance also used to produce stage fog, irritates the respiratory tract. The European Chemicals Agency (ECHA) rejected the application from the Federal Institute for Occupational Safety and Health (BAuA) to classify propylene glycol as a respiratory irritant in December 2016 after thorough examination. There is no evidence of harmful effects from inhaling propylene glycol. Based on the available data, damage to health caused by passive vaping can be ruled out. However, it is a matter of politeness to be considerate of the well-being of other people and to vape discreetly in public or, if necessary, to refrain from vaping. Quoted from: KARL FRANZENS UNIVERSITY GRAZ INSTITUTE OF PHARMACEUTICAL SCIENCES - Pharmacology and Toxicology - Head: 0. Univ.-Prof. Dr. Bernhard Michael Mayer