Heightened competition in the market for legal recreational weed is pushing prices down and firing up border wars across state lines.

Competition is so steep in Washington state that cannabis revenue growth has slowed as Oregon ramps up its adult pot sales.

What's more, in Colorado and Oregon there's more interest from out-of-state investors entering the recreational pot business.

Then there's California, where voters will decide later this year whether to legalize recreational pot.

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Jeff Daniels ~ CNBC ~