Remember another key word in the injury rule. It states injury or "illness." Stoppage for using an inhaler is classified as taking medication for an illness.
Same rules apply as stopping a match for injury. 2 timeouts max. Opponent gets choice of position after 2nd timeout. If match is stopped in near-fall situation, additional near fall point can be awarded.
From the case manual (high school):
8.2.1 SITUATION D:Wrestler A is competing in the first round of a tournament and has an asthma attack. During the time-out, the wrestler takes medication to be able to continue. Is the taking of medication a violation? RULING: No. A wrestler is allowed to take a time-out for an injury or an illness. In the above situation,this would be a time-out for illness and it is permissible for the individual to take medication.