Yea hp nigtrogen is pretty harmless. I used to fill liquid nitrogen tanks for the grad students back in college, and the room would fill with nitrogen...needless to say it got pretty cold in there. Actually the worse thing that ever happened was when one of the valve knobs was loose and actually came off when i was opening it. Liquid nitrogen sprayed all over the palm of my hand (with rawhide gloves on). I had a pretty good burn on my hand from that....