Can you test if you can successfuly lose your consciousness first, with Nitrogen, in the following manner...

[Freakazette]

Since I haven't fainted / became unconscious before, can I test the Nitrogen method by filling first entirely the bag, placed over my head, and turning off the gas afterwards (in order to not waste it further), then pulling the bag on my head and wait? I gather, if I do lose my consciousness, I will stop gripping the bag - on my neck -, it will be loose after and I will wake up eventually, right? Without any damage, though?

 

[Freakazette]

Anyone?

 

[LansJ70]

I think it might be dangerous? Ie brain damage??