I decided to stop using drugs. What now?

Take up thine cross and follow me...
What exactly do you mean by- "what now?"

I think he meens how do i get a hold of myself cuz i can't hold it anymore.... or sumthen :

Seems that quitting is becoming a popular topic these days.
"now what", good fucking question.
I suppose it depends on what you were using drugs for, to enhance, or escape. If you were using drugs to enhance your activities, the answer is easy, just do the same things sober, buck up and like it.
If you were using them to escape whatever parts of your life you were having trouble with, the answer is personal and complicated. Examine what you were using drugs to compensate for. For example, emotional pain, boredom, insecurity, feelings that you were not using your full potential or as a crutch to help you perform tasks that you would not otherwise attempt.
Once you can examine why you used drugs find reasons not to use them, saving cash, not feeling "polluted" all the time, and not having to deal with other peoples opinions of your drug use are all good reasons. Filling your spare time with other activities will help too, idle hands are the dealers worksop, or something like that. Good luck/