Once the person is not suffering from treatable depression and any other factors that are treatable are treated (severe pain for example) then the person should be allowed to die.

This in my mind differentiates a teenager drinking a litre of vodka and 100 paracetamol as their first "true love" has left them for someone else to a person with an incurable neurodegenerative disease making a choice before their quality of life drops below a level they are unable to countenance.

Of course, my two examples are obviously the nice simple black and white ones.

Doctors now have to follow patient wishes far more than they used to - including witholding treatment and care if the patient has specified.

I agree that suicide is a selfish act, but so is smoking or drug dealing - and oh so many activities we undertake.