Pubdate: Thu, 23 Jan 1997 Source: San Francisco Chronicle (CA) Author: Peter Webster Editor -- Re: Letter from Hazel Rodgers, ``U.S. In Dark Ages On Marijuana Use,'' January 22. Perhaps the most interesting use of medical marijuana, and in this case a ``single exposure'' has been known to work miracles, is in the cue of that mysterious psychological condition which renders otherwise intelligent humans willfully ignorant of the truth about the drug. In agreement with Ms. Rodgers, I would say that the demonization of marijuana is a crowd madness on a scale not seen since the medieval Inquisition. PETER WEBSTER Le Cannet, France