Edited and Expanded on October 4th, 5th, 10th, and 19th, 2016
Either way, marijuana and its byproducts should come off of the Schedule I narcotics list. Additionally, governments should legalize and normalize the production of hemp, which is only toxic if consumed in amounts which are impossible to ingest by creatures of our size. Removing marijuana from Schedule I would legalize the testing of new cannabis strains which is needed to officially show that the drug is not harmful when ingested properly.
Until we adopt D.E.A. and F.D.A. policies supporting legal testing - and a drug education policy that seeks to enlighten, not frighten - we will continue to be plagued with problems like addicts being in the shadows, addicts being driven to a life of violent crime, and people overdosing because they don't know whether their dose will kill them.
Additionally, we will still have to face problems associated with young people trying drugs for the first time, not knowing simple things about how to take drugs safely (for example; that they shouldn't hold-in marijuana smoke, because more than 99% of THC is absorbed by the lungs upon inhalation, and holding in the smoke does not increase the drug's effects, but only leaves tar on the user's lungs).
Lack of knowledge regarding safe drug use can lead to overdose deaths, as well as deaths resulting from ecstasy users dying from water poisoning because they incorrectly believed that they needed to drink as much water as possible while on the drug. Moreover, the risk of (non-fatal) overdose extends to marijuana as well; in my opinion, marijuana prohibition has resulted in a shift from smoking to edibles; because ingesting cannabis in foods allows users to more easily conceal its scent. Few marijuana users seem to be aware that the risk of non-fatal overdose (including disorientation) is higher for edibles as opposed to smoking cannabis; I believe that normalizing the smoking of cannabis will help reduce non-fatal overdoses from edibles.