Photos: 7 uses for medical marijuana

Between its outlaw image, controversial legal status and complex makeup -- the cannabis plant contains more than 400 individual chemicals -- marijuana's action in the brain and body is in many ways a mystery. The vast majority of studies on the drug have examined potential harm, as opposed to potential benefits. Even so, some medical uses are widely accepted and others are the subject of serious research. Here's a look at some potential uses of marijuana as medicine.