Plenty of them get hooked because medical professionals prescribe them such powerful shit. Then they are addicted and can't get the prescription stuff anymore so turn to street drugs. It's not all addicts obviously but it's plenty of them.
But now they are straight up playing Russian Roulette every time they use because of the shit that's put into the street drugs. Someone who maybe would have eventually kicked the habit and had a good life just OD's and dies.
Shit is a problem, a massive one. I live in a pretty affluent suburb and this stuff has crept out here too. It's not "someone else's problem", it's gonna affect all of us.