[dTal]

Your point is a bit undermined by the fact that two out of your three examples are cannabis extracts, where cannabis proper - literally a leaf - is still very much illegal and has to be "laundered" through chemical processes to make it less fun and therefore "medicine" instead of "recreational drugs".

[Centigonal]

I think your point and mine can both be true at the same time. Cannabis is the subject of a past regulatory regime that restricted nearly all psychoactive substances popular at the time (natural or synthetic). The actions of that regime do not go away when the zeitgeist changes. The current regulatory regime is much more dovish, and that is visible in the difference between the controlled status of chemicals that became popular recently versus similar ones that were popular 50 years ago.