I'm always surprised at how "little" the use of the taxes for marijuana have made an impact. Either it's being grossly managed, or there's just not as much sales from mary jane as I would have expected.
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It's a big enough new industry that the revenues are non-trivial, but there's a lot of industry and lot of tax revenue out there already. It's not like a bunch of stoners are going to be able to provide the budget for a university system or rail network from a modest tax on their hobby.