Doping

No performance boost noted in studies – which I assume is why Ventolin inhalers are allowed.

"Salbutamol has been shown to improve muscle weight in rats [20] and anecdotal reports hypothesise that it might be an alternative to clenbuterol for purposes of fat burning and muscle gain, with multiple studies supporting this claim.[21][22][23][24][25] Abuse of the drug may be confirmed by detection of its presence in plasma or urine, typically exceeding 1000 µg/L.[26]"

Clinical studies show no compelling evidence that salbutamol and other β2-agonists can increase performance in healthy athletes.[27]

According to two small and limited studies, performed on eight and 16 subjects, respectively, salbutamol increases the performance even for a person without asthma.[30][31][32]

Another study contradicts the above findings, however. The double blind, randomised test conducted on 12 non-asthmatic athletes concluded that salbutamol had a negligible effect on endurance performance. Nevertheless, the study also showed that the drug's bronchodilating effect may have improved respiratory adaptation at the beginning of exercise.[33]