Nitrogen Hypoxia - guaranteed quick and painless, your body doesn’t react as if it was a cyanide or carbon monoxide poisoning as nitrogen is an inert gas.
THANKS for the comment, though I know NOTHING about execution by nitrogen.- I do know that HELIUM works painlessly, as it is used for “assisted suicide” OCONUS.
Btw, a great many of us wild & rebellious TEXICANS see “lethal injection” as “UN-Texan”, even if it did NOT have so many potential problems.
Yours, TMN78247