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What are we learning about medical marijuana?

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The Minnesota Department of Health last week released a study that found 4 in 10 people with difficult-to-control pain of moderate and high levels reported medical cannabis provided significant relief.

Dr. Tom Arneson of the state's Office of Medical Cannabis said the research is a good starting point, but more research is needed. Arneson joined MPR News Host Mike Mulcahy for a look at what research is being done (in Minnesota and elsewhere) around medical cannabis, what scientists are learning, and which areas need more study.

 Use the audio player above to listen to their discussion.