Hypoxia, the best way to die?

I think the death penalty is wrong and, lest anyone worry, I would only consider suicide if I was in pain and a doctor said there was no hope I would get better. But I believe being able to end life mercifully goes hand-in-hand with being able to prolong it, so good ways to die fascinate me. Hypoxia(being deprived of oxygen) is now on the list.

Earlier:Apocarteresis, a natural way to die,