The act of taking one's own life voluntary and intentionally; self-murder; specifically (Law), the felonious killing of one's self; the deliberate and intentional destruction of one's own life by a person of years of discretion and of sound mind.
Suicide is man's way of telling God, 'You can't fire me - I quit.' Bill Maher
If I had no sense of humor, I would long ago have committed suicide. Mahatma Gandhi
Perhaps the saddest irony of depression is that suicide happens when the patient gets a little better and can again function sufficiently. Dick Cavett
They tell us that suicide is the greatest piece of cowardice... that suicide is wrong; when it is quite obvious that there is nothing in the world to which every man has a more unassailable title than to his own life and person. Arthur Schopenhauer
So smoking is the perfect way to commit suicide without actually dying. I smoke because it's bad, it's really simple. Damien Hirst