ZenRaiden
One atom of me
You are the one that puts value on your life. If you dont value it then commiting suicide is really easy.
I think asking whether suicide is ethical or not is a redundant question in most circumstances that fails to try and empathise with or understand what the suicidal person is/was going through. Rather it presumes that person is making an ethical decision within the realms of the consensus mentality, or philosophy 101 class, that that question is raised within. The question prioritises the needs of the person who asks it.
A few people close to me have attempted suicide or contemplated it seriously in the past, two of my close friends have commit suicide, and one of my sister's close friends has, who I also knew. Universally they were all in highly disturbed (sometimes unreachable) mental states in the midst of great hardship. I've sat with people all night through such episodes.
Life becomes a (potentially short-sighted) tunnel-vision of pain, and at a certain point rather than see that tunnel through to the end there arises the need to abort it. It's an action made out of a necessity of ending the circumstance. The action has a destructive consequence, but it's not an action I can subscribe an ethics to, as it appears to me like it's made outside of the context in which normal ethical decisions are made. Rather, in saying "they acted unethically for they hurt me" I make an ethical judgement on something foreign to me that prioritises my (lesser) pain over theirs.
Personally, I am hesitant to ever recommend suicide, as I think intense suffering is usually temporary and can improve with changes in circumstance (which I've observed a few times). If that's not the case and that level of suffering is permanent then it's euthanasia and not suicide.