You have quit. Good. But now you want to start again? What made you quit in the first place? I can tell you without asking. You didn't like it. Doesn't matter about friends, family etc, it all goes down to the fact you didn't like it. A smoker stops because he doesn't like it. For hells sake, just think to yourself: Do I really want that shit all over again?
Go find a hobby, but just don't slice your arm. It's just pointless.