A quiz about what science knows — and doesn’t know — about cannabis.

The seedy reputation of weed is changing — quickly.

First of all, the correct name is cannabis, and 29 states and the District have laws that legalize it in broad ways (and 17 others in very limited ways).

Two major TV producers and an Oscar winner made a sunny sitcom about it. Legal U.S. sales are expected to top $11 billion this year, according to industry tracker BDS Analytics.

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Bonnie Berkowitz and Aaron Steckelberg ~ WashingtonPost.com ~