A database of clinical research and case reports from the last 40 years, maintained by the International Association for Cannabinoid Medicine (IACM).
In 1999, the Institute of Medicine released their report, on the potential health benefits and risks of marijuana. They stress the need for more scientific research.
Based on the effects of cannabinoids in pre-clinical models of neuropathic pain and anecdotal case reports, a controlled trial of smoked cannabis was conducted. Abstract and full text available for download.