Babe Ruth was drunk most of the time he was playing, plus he smoked cigars all the time. Who's to say those drugs didn't give him an edge, or take the edge off lowering his stress levels helping him perform better? I know last time I played a game of touch football I had a nice beer buzz going and my knee that usually bothers me was feeling no pain and I ran circles around guys 10-15 years younger than me.
I forget his name but there was a player on the Cowboy's that used to snort coke in the huddle in the 70's. there have been several highly effective athletes that did that in the past, once they got clean their careers were over.