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The purity can also cause overdoses and deaths because they're not used to it being that pure so they took the same amount they would take with a less pure so took a substantially larger dose. Especially with opium based drugs that would be a big problem.
At a systemic level, this is dependent on what "normal" purity is for users. First-time buyers on darknet markets probably are more likely to overdose because they're used to less-pure products, although I don't have any statistics to back up that guess. But if people are buying on the darknet consistently, they'll be unlikely to overdose due to unexpected purity (though they might still overdose for other reasons).

I'll admit I haven't done much research on opiates specifically for the simple reason that I have never known any active opiate addicts (though, I did get trained to administer Narcan). However, in my understanding of drugs such as coke, MDMA, or speed/adderall, which are more common in the tech scene, higher purity is unambiguously a net positive. It's been a while since I was actually involved in the overlap of the tech/festival scene but when I was around that more, I made anyone I knew used drugs aware that I had drug test kits and would let you borrow them no questions asked. I can't claim I ever saved a life, but I can say for certain that ~30 people at a festival I went to ended up riding out bad trips in medical tents or being transported to the hospital due to MDMA cut with DOC, and none of the people I let borrow my test kits at that festival did.

My knowledge is mostly from living in an area where most addicts were heroin or other downer drugs. While there were a few who had problems with coke and speed most of the junkies I knew were on heroin. And when a strong package is released to the street people start dropping. There are even signs in prisons telling people to be careful when released because the stuff on the street is stronger than in prison.

If you look at who generally dies from drug overdoses it's largely opiate-based drug users. I once listened to two junkies who hadn't seen each other for quite a while talking and letting each other know about who died. They were mostly talking about overdoses, the conversation went on for about 30 minutes non-stop with different names non-stop. None of the cokeheads, eckyheads (MDMA), or speed freaks I knew ever had conversations like that.