There's no reasonable argument against legalizing pot. The tax issue isn't really a problem. They can pass the leg work onto the states. Simply add a national sales tax to the sales tax from each state, and all they have to do is wait for the checks to roll in. A flat rate of let's say10%, across the board, collected by each state, along with an assessment collected against producers, and we're talking about billions of dollars for the taking instead of it going into the pockets of people breaking the law.
All that money could even be earmarked for the job of fighting the battle against drug smugglers, and protection of our borders. It could also be used to promote help for those who need help breaking their addictions to opiods, and drugs like coke, and heroin.
Just my opinion.
EDIT: And by the way. With my back pain, I'd probably give it a shot and see if it helps. I know darned well it wouldn't put me in a position where the opiods the doctors have been pushing would bring me.