I had no idea that drug overdoses are the number 1 cause of mortaliy for people under 50 in the US. Ok I don't live there, and I know from the web and talking to US citizens it's not all as sunny&happy as some media wants the outside world to believe, but this sounds pretty bad. The NYT article wisely doesn't try to point to an underlying cause, anyone? Is it e.g. a worsening of socio-economic factors or is there more to it?