Cancer doctors want more research on medical marijuana - Seven out of 10 oncologists surveyed in the US said they aren't informed enough about the risks and benefits of medical marijuana to recommend its use to patients. It remains an illegal substance under federal law, restricting its research.

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Cancer doctors want more research on medical marijuana - Seven out of 10 oncologists surveyed in the US said they aren't informed enough about the risks and benefits of medical marijuana to recommend its use to patients. It remains an illegal substance under federal law, restricting its research.