He's like a rock star of writing.
Like a rock star, King did all his best work while baked out of his mind on all manner of drugs and alcohol. Also like a rock star, he got clean and all his work after that just doesn't quite cut it.
shareI believe the Tommyknockers is the last book he did while using. He's done plenty of good things since then.
Edit: His first book after getting sober was Needful Things. A pretty good effort.