If marijuana were legal, how many people would buy it? The state of Washington now has an official estimate: 10 percent of the adult public.

If marijuana were legal, how many people would buy it? The state of Washington now has an official estimate: 10 percent of the adult public.

Its value to state and local government in Washington, according to my back-of-the envelope calculation: an immediate $300 million a year.

Here is how I get there. Says the Liquor Control Board:

It is assumed that ten percent of persons age 21 and over will consume legalized cannabis: five percent of those legal consumers will consume an average of two grams a day; the other ninety-five percent will consume an average of two grams a week. It is also assumed that one third of buyers will purchase discount products at $3.43 a gram; one third will purchase mid-range product at $10.00 per gram; and one third will purchase premium product at $15.60 per gram.

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