From the original study:

"Many of the harms of drugs are affected by their availability and legal status, which varies across countries, so our results are not necessarily applicable to countries with very different legal and cultural attitudes to drugs." (1)

And I'm still confused - are they weighting for per-user, or overall?

Under a per-user model this is interesting.

Under an "overall" model this is obvious (legality of alcohol)

Since neither the linked article or the original study make this clear, I'm voting by clicking "flag"

(1) Source: http://www.chanvre-info.ch/info/en/IMG/pdf/drug-harms-in-the...