It's just fear of the unknown. You don't even know how to act when you first stop. Withdrawal is a b*tch, but then it's done. After that, it all comes down to how hard you are prepared to mentally fight your addiction. It is a battle so worth it, and you'll soon learn that the unknown was nothing much to be scared of, anyway. Life goes on, it's just that you don't have a huge, smelly, expensive-to-feed, ready-to-kill-you-at-a-moments-notice monkey on your back anymore. Don't be scared... just jump off that cliff. We got you!