I personally would not risk it but that is because I had a failed attempt with something else that I was nearly certain would kill me but instead just left me with injuries. If you are able to land on your head (is it possible to assure this?) then it would definitely work. You would die if you fell head-first into solid concrete from the second floor probably. And I guess statistics would say you are likely (almost certain?) to die. Then again, people have survived higher falls... I really hope that if you do get to the stage where you feel like you have to jump, that it will not be unfortunate