That’s because the other studies on this topic posted here mostly have one thing in common, and that is that they come from advocacy groups.
In this case the psychology is very straightforward - remove the “forbidden fruit” status, and much of the temptation goes with it.
Yes, somehow we didn’t have too much of a problem before government decided to ban it.
Prohibition didn’t work for alcohol and it isn’t working with drugs.
Prohibition was and is a Progressive idea, not a conservative one.