Dr. Caroline Weber of the University of Washington sent me this chart: table_for_pat_oglesby. It comes from her and from two University of Oregon economists, Ben Hansen and Keaton Miller, and considers about 60 million retail transactions.
The regression coefficient of THC concentration for the tax-inclusive price of cannabis in Washington State is 0.188, if I have the terminology right.
A shift between 10 and 20 percent potency would only increase the price of a gram by much less than a doubling.
The Center for New Revenue 
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