THERE ARE some who take mind-expanding drugs to escape for a while from the banality of life outside, or life inside the mind. Others view such substances as a short cut to the realms beyond the mind, a quick and easy glimpse of nirvana or paradise. Perhaps they may spend a few hours in some psychedelically marvellous other world, but it will always fade away again, and the daily world to which they must return seem duller, or no sweeter, than before.