But there are plenty of reasons to let Colorado's experiment go forward.
Millions of them, in fact.
In March, recreational marijuana sales topped $42 million, with total cannabis sales exceeding $81 million when the medical marijuana figures were added.
At the time, the retail numbers represented a new record.
Now they look modest in comparison with the latest digits.
New Colorado Department of Revenue data shows $59.2 million in recreational sales and $41.4 from medical marijuana sales during August — a sizable bump from those March figures of five months earlier. Add the sums and you get $100.6 million.
The benefits of such revenue for the Colorado economy are obvious — and counties across the state are doing mighty well, too.
We've included a document featuring the latest tax info below. But here's a graphic revealing how much revenue assorted Colorado counties collected from recreational marijuana sales in August....
...as well as one showing the haul from medical marijuana sales....
...and a third depicting local government distribution of the 10 percent retail marijuana tax.
Note that the totals don't include local taxes placed on marijuana by many municipalities.
Those amounts would boost the figures even higher.
By now, it's clear that those who predicted that marijuana sales would quickly plateau once the novelty of recreational sales wore off could hardly have been further off-base. Coming up on two years since the January 2014 launch of recreational sales, the numbers continue to build.
Meanwhile, local governments have become ever more accustomed to the steadily increasing flow of marijuana tax money — and in all likelihood, even officials who opposed Amendment 64, the 2012 measure that legalized limited recreational sales in the state, would find it painful to suddenly go cold turkey when it comes to such funds.
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Look below to find the document compiling data from marijuana taxes, licenses, fees, transfers and distribution for the month of August 2015.