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History: CFC stands for chlorofluorocarbons, which are a chemical propellant used to forcefully push out the mist in medicines like asthma inhalers. In a worldwide "clean air" agreement passed in the mid-1990s, nations agreed to ban products containing CFCs, because they were judged to be harmful to our ozone layer.

A replacement was eventually found in the form of hydrofluoroalkanes (HFAs). So, the United States, as well as other countries, agreed to stop making the CFC inhalers by the end of 2008. HFAs are believed to be environmentally-friendly, but they feel, taste, and smell different from CFCs when used in asthma inhalers.

Source: GSK.com