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he said that Salbutamol has NO inherent performance benefit, it merely allows an asthmathic to perfom to his/her inherent ability just like a non asthma sufferer, no more no less.
This is true, as far as we know, for the permitted doses and routes of administration. It is not true for larger oral doses. There is a threshold for salbutamol not because it might be a masking agent, but because high doses are known to have anabolic effects.
Lifted this comment from cyclingnews, thought it illuminating: