It's a bounty that almost does grow on trees.
A new study has rung in British Columbians' pot purchases at about half a billion dollars each year, leading its pro-legalization researchers to argue current laws mean the province is missing an opportunity to harvest tax revenues.
Researchers from the University of British Columbia and Simon Fraser University have quantified the retail value of black market marijuana sold only to British Columbians for the first time, pegging its value at between $443 million and $564 million annually.
"What's important is to get a sense of how many people are using marijuana in B.C., and how much they're using, and how much that's worth," said Dan Werb, the study's lead author and co-founder of the International Centre for Science in Drug Policy. "That data drives policy."
The study comes as part of a growing campaign of health, legal and law experts to persuade politicians in B.C. to look at alternatives to the current system they argue fuels gang violence and does nothing to reduce drug use.
The campaign has gained momentum after Washington State and Colorado voted earlier this month to legalize, sell and tax marijuana, and the study's researchers are already watching lessons from the incoming implementation.
Using data from Health Canada and the Centre for Addictions Research of B.C., the researchers found the population of marijuana users to be about 366,000 and the retail cost to be about $7.50 per gram.
They used data about how often and how much is used in conjunction with those figures to determine the size of the illegal provincial market.
The paper doesn't specifically estimate tax revenues.
"But what it does is lay the groundwork and points to a few ways policy-makers could start looking at tax revenues," Werb said.
He cited government data from Washington State, which lays out the fiscal impact of the marijuana ballot initiative, and noted the population of weed users in BC's neighbour to the south is estimated at 363,000, a very similar number to BC.
Two economists at the University of British Columbia agree that millions in tax revenues would likely be generated from regulated pot sales, though they suggested caution be taken in estimating the enormity of the windfall.
Prof. Werner Antweiler said economic principles suggest that taking weed off the black market and into a regulated system would lower the overall price of the product, though not its demand, and therefore generate less.
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