Passing morphine withdrawal is an interesting experience. I tried once, and it was by far the most physically intense pain I have ever experienced. Even with the most powerful sedative I could only cry in pain. If I was out of luck and on the streets I'd steal stuff to avoid it again. (Not that I would. Even entry-level coding is enough to avoid a junkie lifestyle. I did it just for the experience. Also, I gave up after a few hours.)