It's it's Dual nature.
Cannabis in modern terms is the part we smoke and it has a political and economic utility.
We all know Cannabis is a Trillion Dollar a year industry*.
I assume with the Treaty issues and the U.N. is that we may not understand how the U.S.A. has acted on the world stage in both regards.
There has been reports that our CIA has used drugs and drug-economics as a tool and may well base policies around the U.N. agreements. On the other hand we had to allow drug trade to continue in Afghanistan.
I'm sure we are up against the Stone Walls of American Federalism and the principles of these United States of America in regarding States rights.
Can the Federal Government say Marijuana is too dangerous, will be abused and of no medical value facing a different now and in the future demographic than the 1040's?
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* When we consider all related spending. I believe world wide counting all the related sales Cannabis is a trillion dollar thing. Things like cannabis and grow equipment, electricity sold, wages, munchies building supplies, fertilizers, the weed itself and so on.