(HealthDay News) -- If you legalize medical marijuana, a sizable number of cancer patients will sign up, a new Washington state survey suggests.

One-quarter of cancer patients in Washington use marijuana, researchers found.

But the study also revealed it can be a challenge to get information about the drug from health care providers.

"Cancer patients desire but are not receiving information from their cancer doctors about marijuana use during their treatment, so many of them are seeking information from alternate nonscientific sources," said study author Dr. Steven Pergam of Fred Hutchinson Cancer Research Center in Seattle.

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