Shit man, that sucks. Sorry for your loss. It sounds like you really cared for them and even tried to get them help.
You Americans and your obsession with drugs though...
Don't mean any offense by that but the US really has a serious drug problem that is getting way out of hand.
We (Mexico) also suffer the consequences; as long as people continue to use and demand keeps rising in the US, supply will too. 20 years ago we used to have 2 big cartels in Mexico, now there are over 15 big ones, all struggling for power over the market.
My problem is not that my friends die from drug use but they've been killed or kidnapped by drug manufacturers/smugglers (narcos).
It's also an internal social/economic problem, it's not only the US' fault, but it certainly provides a platform for the poor and disadvantaged to jump on.
Drugs are literally killing our countries, man. Fucking stupid drugs.