How effective is marijuana for medical purposes?

Many proven benefits: There are many benefits of marijuana, including relief of nausea & vomiting, seizures, migraines, glaucoma, muscle spasms, ocd, add, anxiety, depression, insomnia, asthma, pms, menstrual cramps, irritable bowel syndrome & chronic pain, esp. Neuropathic pain. It often helps problems not relieved by other meds. It has anti-cancer properties. See http://norml.Org/library/recent-research-on-medical-marijuana.