As a precaution before every dive I will use a rescue inhaler and that is the only time I ever need one.
this would concern me.
1-if your asthma is such that you feel you need to take your inhaler before diving as a preventative measure i would be concerned
2-i don't know if there are any studies regarding these types of meds being used while diving at depth but i think caution should always be used when using any meds.