This method was used for the first time in Alabama last week. For at least two minutes, Kenneth Eugene Smith appeared to shake and writhe on the gurney
The fact that you don’t understand displacement of lung (and bloodstream) gas content tells me you don’t have enough of a medical background to understand wtf you are talking about.
CO2 isn’t “replaced”, it’s getting breathed away like in a normal atmosphere. The atmosphere is 70% nitrogen, it’s not like it’s a toxic gas.
The fact that you don’t understand displacement of lung (and bloodstream) gas content tells me you don’t have enough of a medical background to understand wtf you are talking about.
The fact that you’re repeating the same words again and again tells me, you just read something you don’t quite understand and act like an expert now.
I’m not the one with the burden of proof to prove that it is painless.