You are giving the pot warriors theme. You cant stop it, so go with it.
No, that's not my argument. My argument is closer to: When in a hole, stop digging.
I disagree, we also try to stop theft, murder and rape. I think those will never go away either.
Two-thirds of murders are solved - the proportion of drug "crimes" that are even detected is assuredly orders of magnitude smaller.
Also make sure they can't get the crap for a headache, unprovable back injury or for minor health issues of the day.
I have zero problem with the 3-4% of legitimate use, the rest is all recreational drug abuse no matter what holes you think you are digging.