Earlier quoted context omitted.
Portugal decriminalised personal possession of drugs 15 years ago, which has given us some useful evidence. HIV infection rates and drug-related deaths have reduced significantly, and the prison population has reduced by over 50%. The proportion of people who have ever used drugs has increased slightly, but there has been a reduction in the number of regular drug users. We don't really know what would happen in a lai…
But Japan and Hong Kong and many others still have far lower drug use and crime rates despite their very tough laws on drug use, when compared to Portugal.
Source: I had Japanese roommates in college who turned out to be potheads. They raved about the super-cheap marijuana they could get in the US, which was 1/5 to 1/10th the price as was available in Japan.