this link on the winter olympics and asthma bit.ly/axqSjM has a section that I know partially true, Beta2-agonists are on the banned substance list for competitive events, but the bit about promoting muscle growth? never heard that yet.
""The most commonly used bronchodilators, a class of drug known as beta2-agonists, are prohibited by the International Olympic Committee (IOC). Because beta2-agonists can promote muscle growth, athletes with asthma must prove they have the disorder and must receive permission to medicate themselves; otherwise, they run the risk of being disqualified from the Games. ""The IOC has really cracked down on this,"" says Georas. ""A few years ago, a lot of people declared themselves asthmatic, which was thought to be a way to get inhaled steroids.