That logic doesn’t flow, though. You need to compare number of current illegal users vs number of users before it was illegal.
Have you heard of the US prohibition on alcohol? It’s a pretty famous counterexample to your argument showing that it absolutely does not reduce usage.
My argument is that since illegal drugs have significantly fewer users, prohibition does reduce usage.
That logic doesn’t flow, though. You need to compare number of current illegal users vs number of users before it was illegal.
Have you heard of the US prohibition on alcohol? It’s a pretty famous counterexample to your argument showing that it absolutely does not reduce usage.