I've never tried to quit before so can't speak from experience, but from what I've read if a person does start drinking again it hits the limbic systems reset button. All that time fighting urges gets wasted, and you're back to square one.
Think of it this way; the dumbest kid in class will remember which house gave the biggest chocolate bars last year at Halloween. That's what you risk waking up, evolutions deeply rooted reward system with a really long memory.
It sends a cold fear into my gut even thinking of trying that.
Murray