His friend group were always pill poppers, and a number of them started popping oxy. In two years, three of them have died. They all moved from oxy to heroin. All of them were snorting it, rather than shooting up. My friend told me they got heroin with fentanyl without knowing. He told me this when he came to visit from my old hometown, while he proceeded to crush up and snort an oxy in front of me. He told me he'd been buying heroin recently as well.
I knew at that moment he'd be dead soon too, so when his family gave the news, it didn't come as a shock.
The Sacklers are pure evil. Heroin is a serious problem, but there's a major hurdle that it faces: people know that heroin destroys your life. People trust their doctors, and they don't associate oxy with heroin, but it's a life destroyer just as much as heroin.
Most of the discussion here seems to be about hardcore addicts, and the issues that come from them, but they're just the face of the problem.