drugs seem to be a pretty big part of the jamband scene - i would guess that at the last CTF that maybe 80% of us were wasted from something or another at one point. from a players point of view, my experience is that drugs can only enhance something thats already good to begin with. there has got to be good energy already present - if there isnt, then a drug will only bring the energy level down. when drugs create problems for musicians (for anybody!) is when folks take them to get into a good place, the good place has to be there first! if it is, and if things are taken in moderation - then a few extra doors can be opened, especially in the improvisational jamband context. now i'm a piano player so i'm maybe a little more free to 'mentally experiment' then would be a drummer who has the primary and more physical job of maintaining good solid time.