Jails, County, State, and Federal prisons are all different. It would definitely make sense that the more serious convictions, especially with harder drugs, goes to federal. That's kinda the point of federal...
All of the money put into cops, lawyers, prosecution, sentencing, prison, parole, etc could be put into tackling the consequences of legal use.
All of the money currently flowing into the black market, into gangs, into crime and violence causers, would try up.
How many of those that graduated to crack/meth etc. started out with simple marijuana arrests?
https://www.pewresearch.org/fact-tank/2020/01/22/four-in-ten...
Which I happen to agree is a waste of resources and probably does more harm than good by getting people started "in the system".
It is difficult, but we have to try to be aware of the biases in the data we have. I should have mentioned in my first post that those were just federal stats. But I try to break down more in another comment state and jails, specifically about possession statistics.