is sn really peaceful?

[Amarajoy]

It's not difficult to acquire a nitrogen bottle and regulator in most locations. They're extremely common in industrial applications, mostly welding. Nitrogen hypoxia basically means you just fall asleep, because breathing nitrogen doesn't sustain cell life (like oxygen) but doesn't set off the body's natural suffocation alarm system.

I've read accounts of people possibly ripping the bag/hood off? Is this not a concern? This was my first choice until I read that.