I am a firm believer that the right amount of whiskey brings out ones best in playing. A little weed helps too. With other drugs I feel I get too erratic and sloppy, I can see where I was trying to go listening to it afterwards, but it usually doesnt seem to be any where good listening to it sober.
One of my favorite movie quotes (dazed and confused); "Man, I ain't believin' that shit about Bonham's 1-hour drum solo...I mean, 1 hour on drums...you couldn't handle that shit on strong acid, man."