From Google Video:
"Former Conservative MP Michael Portillo pushes his body to the brink of death in an investigation into the ... all ยป science of execution. As the American Supreme Court examines whether the lethal injection is causing prisoners to die in unnecessary pain, Michael sets out to find a solution which is fundamentally humane. Armed with startling new evidence, Michael considers a completely new approach. Will it be the answer? There is only one way to find out - to experience it himself."
"Former Conservative MP Michael Portillo pushes his body to the brink of death in an investigation into the ... all ยป science of execution. As the American Supreme Court examines whether the lethal injection is causing prisoners to die in unnecessary pain, Michael sets out to find a solution which is fundamentally humane. Armed with startling new evidence, Michael considers a completely new approach. Will it be the answer? There is only one way to find out - to experience it himself."



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On the other hand, rather this than having them jump in front of a train or throwing themselves from a building. Atleast this method saves society the gruesome job of cleaning up such a mess.
Has there been any research on how many suicidal people don't go through with it, percent-wise, due to the fear of a painful death and/or risk of screwing up?
Not long ago I was near suicidal, and I think if I had access and option to such a painless euphoric death, things may have turned out differently.
[EDIT: OK, I guess that seems a little morbid. All I mean is that I have no interest in being a wheelchair bound octogenarian wrestling with a bad hip and dementia. And considering all the different ways to check out, sailing out on a nitrous high doesn't sound to bad.]