I've got this character with pretty severe asthma. Pollen and dust are the primary triggers, but exercise exacerbates an attack if it happens during periods of physical exertion (like a basketball game, for instance)
So my question is... how does one artificially induce an attack? My character is the star player on his basketball team and needs to be taken out mid-game. Would someone tossing a handful of superfine talcum powder or sawdust right in his face do the trick?
ETA: I've finally decided to go with a severe peanut allergy, as that fits my purposes better than a simple asthma attack. Thank you very much for all your help- it's much appreciated!