[MichaelGG]

Heroin and opiates in general simply are not very harmful, referring to the actual medication. Apart from acute respiratory depression (OD'ing), there isn't much except constipation. Overdosing is dangerous for many drugs - more people end up in the hospital from misuse of Tylenol and ibuprofen than from, say, Oxycontin.

So it's very unfair to allow only certain people access to basic medications, especially when the medicine itself isn't particularly dangerous. The study you linked has a rather expanded definition of "harm".