Don't bother with the video, there's very little information aside from the fact that in 2001, personal use of drugs was decriminalised and by 2009 they could see a drop in HIV infections, overdoses, and deaths.
Sorry but that’s just not true.
I was there so I know for a fact that the most destructive kind of addicts simply vanished.
I'm not going to say there aren’t many high functioning addicts, there might be.
In the late 90s the streets in certain cities were overflowing with addicts (as in walking corpses almost) and that is simply not the case anymore.
I'm yet to see any definitive numbers on how many people just buy drugs on dole and stay high at home.
I've yet to see any definitive numbers on any other number of other scenarios of speculative fiction.
Found the following report.
I'm curious what "sources" you spot checked against, given this report is from Australia's Dalgarno Institute. An institute that, quoting them:
"To shift the community and particularly adolescent, young adult and family attitudes about alcohol and other drugs away from the cultural expectation of participation, to consider the option of ‘not having to’.
However you measure life outcomes, the best possible cocaine and heroin intake is exactly zero. The report cites statistical agencies' numbers and they match the sources.