But today, the World Anti-Doping Agency, known as WADA, is voting on whether to take the mountain away and place altitude tents on next year's prohibitedlist of substances and methods.
The process resembles the hunt for performance enhancements used by athletes, where a few get caught but the cleverer ones stay ahead by using products not yet on the prohibitedlist.
Stilnox, used to treat insomnia, is not considered a performance enhancer and is not a banned substance, but the Australian Olympic Committee (AOC) put it on the prohibitedlist ahead of the Games.