btw: here is an excellent talk on the effects of prohibition. Now this is focused on drug prohibition but the big picture concepts are universal. Plus drugs would be your primary/traditional point of interest anyway hah https://www.youtube.com/watch?v=hIlOHfEEorg
Now I'd recommend the whole thing, but in particular there is an insight about 15 minutes in that blew my mind in terms of how intuitive and clearly correct it was - yet I'd never thought of it that way. It concerns the way prohibition affects the potency, and the examples given are just incredible.