BOSTON (CBS) – For the first time, there’s a trade show for pot here in Boston.

And it’s all about the business opportunities that legal, recreational marijuana could offer in the state.

Retail sale of marijuana is expected to begin in the middle of next year. That means entrepreneurs are trying to get in on the ground floor.

“This is the face of cannabis now,” says Dan Humiston, one of the organizers of the Cannabis Expo, pointing to the clean-cut people attending the conference.

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