Smoke dope and dirnk before a gig to meditate and enhance your playing? I don't know about you dude but for me playing comes from my heart and can be a very emotiomnal thing. I don't need anything to enhance it. Thats analogous to a body builder taking steroids to enhance his physique. He may be big but it aint real.
I don't mean to offend but thats just my take on it. I've played straight and I've played stoned.