I didn't know SS, so I started thinking about it and I thought that if I put a bag on my head, being closed and gas constantly entering, it would end up exploding, my option was an airtight mask of the kind used for CPAP (sleep apnea) there was no leaks in the mask, the problem was the pressure reducer. Even though the regulator was sold by the same nitrogen supplier, it didn't seem like a very solid connection. I used Teflon and tightened the nut with a wrench, however, when I lost consciousness the bottle would move or hit it and that caused a leak between the cylinder and regulator. I cried when I woke up hours later and discovered that the bottle was empty... But I don't understand, the car was sealed and even if it didn't reach my nose directly I should have been breathing in what was escaping... it cost me €350 for the attempt. .. a shame.
I'm not sure if my facial paralysis was caused by the nitrogen, it's almost non-existent after 1 month.