Oooh, a mask... I did not think of that. I usually only heard about plastic bags and I was always afraid they could blow or have enough holes to kill your brain without killing you.
Another fun fact. When you replace oxygen with another gas, you will suffocate and that is a crappy death. You get panic, its painful and so on. BUT there is that gas that lets you not feel like your suffocating. Additionally you loose your conscience quickly and you die without noticing it. I forgot which one it was, but I guess its Helium.
A word of warning though. I head the tank is kinda noisy, so choose a day, when you're alone. You don't want someone to come in because they think there is a gas leak.
Careful, depending on the noise neighbors could be alarmed as well.
I am still panicky when it comes to certainty. If I ever do that, it MUST work. 100% certainty. I always thought about constructing something that lets me fall into a robe strangling me afterwards. Just to be safe. Maybe that's nonsense, but I am a coward. And peops, IF you do that, make sure you fill out the paperwork that kills you afterwards, when you're a vegetable in a hospital. Like forbidding them to feed you or something like that. Depends on your country.
There are organisations that can give advice, go to a lawyer and make that waterproof. Spend that money! YOU will not be able to enforce your rights afterwards, if the suicide attempt goes wrong. Furthermore: You have the time to read up on that in more detail. Don't trust crap from the internet. Invest ten hours or more to research that properly. You don't want to make a mistake here.
Anyone actually really thinking about it or is it just interesting for the future?
Good find, by the way.