I've gone through my phases with it. I, like many people, thought it "made me stupid" and a whole host of other negative things. There were a few pivitol things that helped "undo" that mentality. Talking to a professor at college was one of them, reading one book in particular was another, but the biggest one is this.
I am most productive, in and outside of work, when I am happy and stress free. Because of this, I go out of my way to ensure that the majority of my life is spent happy and stress free. Many things contribute to this. Exercise. Living at the beach. Keeping my finances in order. Listening to Music. Marijuana use.