What good is marijuana for medical purpose?

Cannabis has several medical uses, but they are poorly documented because government regulation has made it nearly impossible to conduct real scientific studies on the drug.

Cannabis relieves interocular pressure, so cataract patients find relief without debilitating chemical pain and pressure relievers. It also reduces nausea, so patients on chemotherapy will use it. And because it reduces neurological pain better than any analgesic or any other pain medication, MS patients with neurological pain will also use it.