It's only an hour long, if you haven't seen it yet, you should. Obviously most of us would agree, but even to an outsider it's definitely an eye opener.
Cannabis should not be grouped with the rest of the drugs on the market IMHO. Poppy plants and coca plants are naturally occurring in the world as well, and from what I understand, are completely harmless on their own. The refinement into illicit drugs is what makes them harmful ... and it's also what makes any pill manufactured in a lab dangerous too. People don't need high concentrates of those substances, in fact it's harmful. Yet in a holistic way they can be used, like many other things that are naturally occurring in the world.
People don't want addictions, and adding legal ramifications doesn't quell usage. Deal with addiction as it is, don't add more problems.