Good question, I have asthma too (hope thats what you meant

!!) I would think not unless you have some funky smells coming from the tank, I've seen people post some questions about that, my tanks have never smelled though. Or if a fish jumped out and decomposed, but it would have to be a pretty big fish!
I just found out I'm pregnant, so I'm starting to wonder if I can get some sort of weird fish disease now! I'm sure we'll all be fine
Good point with the mold Harlock!! If that is something that bothers you, it might be worth having someone else keep the underside of your lids well cleaned