Not that I really give a shit what anybody else thinks, but I've had several friends that have become very addicted/obsessed with N2O - we call it "hippy crack". One of my friends kept doing it by the tank which was fine for a while, but after a few weeks of repeatedly using it he would start to blackout every single time - he got major concussions, he freeze burned most of his face, and he ended up with major brain damage he later found out while at the hospital; the bad thing was even when he stopped months later, he still kept randomly blacking out - even to this day. Not to long ago he blacked out while driving and hit a massive pole going like 60mph and came very close to dying, so now he's in a half-vegetable state and can't do much becuase of the blackouts. I'm not against N2O+pure Oxygen in moderation, but I don't think that N2O by itself is the safe little party drug that everyone wants it to be.