Yet heroin USE has remained flat at about .1% for the last 30 years.
So, what's more significant? Purity, cost or actual use?
"So, what's more significant? Purity, cost or actual use?"
Well, I think purity and cost relate to supply and demand, as I suggested.
The relatively low rate of users hopefully demonstrates that drug education IS working and that most people are smart enough to not fool around with heroin.
To answer your question directly, a low or zero rate of use is the desired outcome, of course. Heroin is destructive.