“The paper, published by Cato in April, found that in the five years after personal possession was decriminalized, illegal drug use among teens in Portugal declined and rates of new HIV infections caused by sharing of dirty needles dropped, while the number of people seeking treatment for drug addiction more than doubled.”

Thats from a Time article recounting Cato research. Time didn’t note that Portugal has also seen an increase in far-out music production and fantasy writing.