In reply to:

It seems to me that if this strange situation is a voluntary contract between to competent adults (emphasis added)

I think this is where the question is... Under normal circumstances saying its ok to kill me is a hint that I'm NOT ok....
This is without introducing questions like... Am I my own property? Notice that all of the actions he went through were warning signs of a depression related suicide. The inclusion of canabilism should not diminish the fact that it was suicide. Also the inclusion of assisted suicide arguments isn't really helpful (assuming that one believes that mercy killing is all right which I don't) since the article doesn't mention any sort of physical illness.
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Michael West