"'Vicki Christophersen, a lobbyist for the marijuana industry who heads the Washington CannaBusiness Association, said the increasing revenues for marijuana shops show the regulated marketplace is effectively competing against the black market.

'We wouldn’t be selling to that level if we weren’t,' Christophersen said. The price of products on store shelves now, despite the tax, 'are competitive with what we thought the black market was at one point.'"

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