Having been on the receiving end of both, I'd rather be tazed any day. We had a student who had a canister of bear repellant in his backpack go off in his locker. I think it got punctured on something, anyway, even from inside the locker it fogged the hallway. Sent 11 students to the hospital for asthma attacks. Luckily for him, he got prior permission for it to be in the locker. It was bear season and was already freezing outside, didn't want to take the chance of it getting messed up in his car. They were going hunting after school.