> There was a bit of an uproar a few years back about how many premiership football players were using asthma medication, a higher rate than the general population. The implication being that they were using them as performance enhacning drugs. But if you take into account that they disproportionately come from poor inner-city areas (not all, but many more), the proportion with asthma looks much more in line with the background rate.

That part can also be explained because asthma drug is used as masking agent when taking steroids and other PEDS, which is quite common at this level.