Sounds like suffocation without the agony. Well, so it seems.

Carburetor cleaner has ether which I have used to peacefully put some dying pets down. Plastic bag over their head with the spray inside helps them pass gently., peacefully, painlessly.

CO2 is cheaper, dry ice, tent, heating pad, easy.......
Many of the fool's buying Nitrous oxide die from O.D. More pleasant as CO2 excess makes you claw for air.....

This would be nice to have as an option for putting pets down when its deemed, and also for people struggling with terminal conditions or such.
Its grim to think about but what's worse, giving a person the option to peacefully end their suffering, or forcing them to endure up to the point of their painful, traumatic end?

Sounds like a solution this life is creul thier god is creul why put us through heartache pain and depression does not sound very god like or enlightning Loving even .

I had to put down a few pets in my life chemically. I don't think nitrogen is available for that , too bad.

Way to go man !