It's my understanding that street drugs like Heroin were frequently cut to varying, sometimes unpredictable degrees prior to the introduction of fentanyl. So yo

It's my understanding that street drugs like Heroin were frequently cut to varying, sometimes unpredictable degrees prior to the introduction of fentanyl. So you could still easily misjudge your dose and OD due to the lack of any kind of consistency. Presumably this would also make it even harder to try to taper off the addiction gradually.