We talked about this at work, and we just don't see it actually becoming legal for the "tax" reasons.
Its too easy for a individual to grow, with the correct knowledge (internet) and equipment (money). Compared to making your own beer.....so the idea of taxing the product wouldn't be worthwhile because you cannot tax something that a individual grows.
There's also the possibility of lacing it other narcotics (mostly Class B or E) which can lead to death.
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