Gosh. I remember when I was a wee little lad, curiuos about everything (and stupid). I wanted to fix some transformer my brother broke, so I took out super glue. On it said "DO NOT INHALE". Being the stupid kid I did who would do the opposite of what WARNING notices said, I took a deep breath of it. All I can say is, it hurt as hell. It goes right up to your head.
So far no allergy to superglue yet but my exposure to it has been minimal. Its not the most versatile of glues to use and it somewhat damages most plastic so I usually use a hot glue gun.