https://en.wikipedia.org/wiki/1,1-Difluoroethane https://en.wikipedia.org/wiki/1,1-Difluoroethane > [1,1-Difluoroethane, or DFE] is also used as a propellant f

https://en.wikipedia.org/wiki/1,1-Difluoroethane https://en.wikipedia.org/wiki/1,1-Difluoroethane > [1,1-Difluoroethane, or DFE] is also used as a propellant for aerosol sprays and in gas duster products. > Because of inhalant abuse, a bitterant is added to some brands; however even this measure is not legally required and has not prevented widespread use of this product as a drug. > In a DuPont study, rats were exposed to up to 25,000 ppm (67,485 mg m−3) for six hours daily, five days a week for two years. This has become the no-observed-adverse-effect level for this substance. Prolonged exposure to 1,1-difluoroethane has been linked in humans to the development of coronary disease and angina.[12]