Remove Marijuana from the List of Controlled Substances, Remove it as a Schedule Drug. Allow the individual states to create and inforce their own legislature in regards to Marijuana.
Marijuana has been proven to be of great medical importance, there are no addictive qualities to Marijuana, and is, by far, less harmful than Alcohol. The studies have shown and proven all this to be true. The regulation, or lack thereof, should be left up to the citizens of the individual states.