Every time Blasts shows off his science credentials I bust out this picture...
I tried the super glue and cotton ball thing once. It didn't end well. Much like the time when my mother decided to clean a bathroom and thought mixing bleach and ammonia would "work better."
Years later we still say "That was the time mom made chlorine gas!" I also heard that that is how you make hydrazine (rocket fuel) so now I can say "Mom, you are a rocket scientist."
I once had to transport a patient that had done the bleach/ammonia thing. Funny, I was the only guy in the responding units (ambulance, fire truck, and a paramedic ambulance unit) that had the necessary background to say "Hey, you know, I'm pretty sure that was chlorine gas he decided to fumigate himself with - you know, the stuff from WW1." I got a bunch of blank stares in return. (Please don't construe this as a slam against medics or firefighters - the ones that do get additional training are WAY smarter than I am in that field.)
The patinet turned out OK, AFAIK.
Cyano just means a carbon and nitrogen linked together (Blast, correct me if I'm wrong). There's stuff in the human body that uses cyano groups, but as Blast said, when they're bound with other things they tend to be less offensive.