As much as I expect this is a cynical response. There is some evidence this could help. To some  extent this is a zero sum game.  This group has only so much money to spend on drugs. If there was easier access to best quality cannabis as a substitute for their primary drug of addiction. Cannabis is by far the safer of all of the drugs of recreation. By the way this includes alcohol and cigarettes. The same zero sum argument can be used for them as well for those at the lower  end of the income spectrum. (as in the ones who are having the most personal and societal trouble with drug over use.)