One of the canards regularly raised by opponents of medical marijuana is that it just gets people high and doesn't provide real medical relief. For example, last year former deputy drug czar Scott Burns told a California newspaper, "Anybody can say something makes me feel better anecdotally. And I hear that a lot.  'Marijuana is the only thing that makes me feel good.' I say you should try crack, because from what I hear, crack cocaine will make you feel really good as well." Anyone inclined to believe…