Marijuana, already shown to reduce pain and nausea in cancer patients, may be promising as a cancer-fighting agent against some of the most aggressive forms of the disease. A growing body of early research shows a compound found in marijuana - one that does not produce the plant's psychotropic high - seems to have the ability to turn off" the activity of a gene responsible for metastasis in breast and other types of cancers. Two scientists at San Francisco's California Pacific Medical Center Research Institute first released data five years ago that showed how this compound - called cannabidiol - reduced the aggressiveness of human breast cancer cells in the lab. "The preclinical trial data is very strong, and there's no toxicity. There's really a lot of research to move ahead with and to get people excited," said Sean McAllister, who along with scientist Pierre Desprez, has been studying the active molecules in marijuana - called cannabinoids - as potent inhibitors of metastatic disease for the past decade. Martin Lee, director of Project CBD, [a] group that works to raise awareness of the scientific promise of the compound, described the cannabidiol research as potent both as a medicine and a myth buster. "It debunks the idea that medicinal marijuana is really about people wanting to get stoned," said Lee, author of Smoke Signals, a book published last month about the medical and social history of marijuana. "Why do they want it when it doesn't even get them high?"