Inhaled gases include gaseous therapeutics (helium/heliox, CO, NO, dioxygen (O2), H2S) toxic concentration of noxious gases (NO2, Cl2, H2S), methane (CH4) and poisonous gases (e.g. cyanide, H2S, CO, NH3). May be used in suicide attempts inluding helium (PMID 25254616). Inhaled fumes, vapors, aerosols, fire extinguisher powder, white smoke should be considered (PMID 29991044), and anesthetic gaseous agents. Rescue personal, family and neighbors can be exposed and suffer harm or fatalities. Suggested readings: PMID 24275172, 30189064, 30608256