“…Veronda et al (2019) were the only study to consider ETS. ETS contains many chemicals that are toxic or carcinogenic, including but not limited to ammonia, hydrogen cyanide, toluene, butane, benzene, and carbon monoxide (Rashidi et al, 2020). This was an important consideration because non-smokers may be facing sleep issues disproportionately if they are exposed to people that do smoke.…”