Why don't states use nitrogen chambers for the death penalty?

[Lucas_Jackson]

@Slithy_Tove

Workers die of it every year.

I actually wondered about it as a mean’s of execution when I read the link in post 11 of this thread:

Oxygen = Life?

Not directly related to the OP but of interest, I think, is people dying who go into a chain locker on a ship if they do not wear breathing apparatus (it has happened). The oxygen in the locker is captured by the metal as it rusts until no oxygen is left. It shows how easily oxygen can be removed if nothing replenishes it.