Stay busy. Catch up on the life you been missing out on because of drinking/drugging. If your lifes full you wont be worried about finding something to fill it with.
When I was new a friend of mine gave me a book called living sober. It's an AA book that would be useful regardless of whether or not you are using a 12 step program. It's basically a book of things to do instead of drinking or things to do when you are wanting a drink. it was really useful.