In a first, an American woman used a suicide pod to take her own life. The process took place in Switzerland. It’s done by pumping in only nitrogen gas, so the person will lose goes dizzy, loses consciousness and eventually dies. Enter futurama memes.
Probably comfort. There could be complication if using non-airtight mask, as this method use nitrogen and our air is like 78% nitrogen, could actually take longer for one to go, and airtight mask is uncomfortable. Also they probably don’t need too many of these as demand probably won’t be there anytime soon, so manufacturing isn’t much of a concern.
Good point you and others make about airtightness.
For the manufacturing, I’m primarily thinking about how assisted suicide is illegal in most countries, so the ability for anyone to make it, and to make something small, may have some value versus a large, hard to transport device.