Barry, yes, ammonia can be pretty darn hard on you, temorarily and permanently. My only real experience with it was when I deceded to clean my sink in an apartement I was living in years ago with toilet bowl cleaner (it is awesome stuff right?) and bleach mixed, heck yeah, both work great so why not together?
The ammonia in the toilet bowl cleaner and the bleach make chlorine fumes! It was vicious.