Silent killer?  Come on, you can do better than that, can't you?  Not many people believe the reefer-madness era propaganda, anymore.  If there is cancer-causing fungi on cannabis plants, why have no studies linked cannabis smoking to lung cancer?  Where is the proof?  Besides, if it were legal, it could be eaten instead of smoked.  That way, it is, by far, the safest and least harmful intoxicant on the face of the earth.  That's one thing the prohibitionist never want to talk about: the fact that the policies that they support make it more harmful for those who choose to use cannabis.  Due to prohibition, it must be smoked because it is prohibitively expensive to eat, it may be laced with pesticides or other chemicals because there is no regulation, etc.  And don't get me started on how cannabis prohibition fuels drug violence across the globe.  It this all worth it for a policy that have been proven to have no effect on cannabis usage rates?