There is a good documentary on this topic on the PBS website - it profiles a man who had ALS who chose to go to Switzerland where he could receive medical euthanasia.
The Suicide Tourist | FRONTLINE | PBS
I personally believe that adults should have the right to end their own life if they so choose and that a peaceful means should be available to those with chronic, progressive, painful, and/or terminal diseases.
I have read that in Oregon, where people with terminal conditions can be approved to receive a medication that will kill them, that more people sign up for the pill than actually use it. Knowing that they have that ability to CHOOSE to go if it ever gets so bad relieves a great deal of their mental anguish...and then end up sticking around until the disease takes them out instead.
Makes a lot of sense to me.
People with severe mental health issues such as life-long depression, schizophrenia, etc, - well that becomes more challenging to make a decision on.
But I always ask the question: why should anyone else get to make the decision as to how long a person is supposed to live? If I knew someone had endured years of suffering and wanted out, it would pain me greatly to know that, but would it be right for me to insist that they keep living just because I don't want them to die?
Interesting questions to ponder I think.