Very had to compare to Japan because Japan essentially legalize organized crime. Yakuza are allowed to operate as long as the follow a minimum set of laws.
Basically Japan is following a tradeoff where they have chosen organized crime of lots of unorganized or violent crime.
So it will be very hard to compare such a system with a western country which deals with these issues in such a different manner.
I can mention that drug use is fairly low in my home country Norway as well despite pretty lax laws.
We are doing something very wrong with respect to heavier drugs like heroin though since we have a lot of overdose cases. But Switzerland and the Netherlands seems to be quite good at this and they have very liberal laws.
Basically Japan is following a tradeoff where they have chosen organized crime of lots of unorganized or violent crime.
So it will be very hard to compare such a system with a western country which deals with these issues in such a different manner.
I can mention that drug use is fairly low in my home country Norway as well despite pretty lax laws.
We are doing something very wrong with respect to heavier drugs like heroin though since we have a lot of overdose cases. But Switzerland and the Netherlands seems to be quite good at this and they have very liberal laws.