YOur “studies” are garbage.
As a child of the 60's, I know very well that habitual use of pot CAN induce paranoia, not that I ever "inhaled".
Most give up pot by 30 or earlier because it DOES induce "paranoia" (the cops are going to bust down the door any moment), and the stupid laughs and munchies get old. Most move on to alcohol and some move on to other drugs, others just stop.
Again, not sure about total legalization, but bona fide Doctors should be able to prescribe it for various illnesses.
Last thought: If the DEA and other LEO's re-directed their resources to stop the truly damaging drugs, that would be a good thing.