Yeah, I can see why addicts are cutting dope with fentanyl, but I hear that some dealers in places are adding fentanyl to the dope at the milling/ cutting and bagging up houses, and I don't see why the dealers would do that. Fentanyl is not as good as dope in my opinion, it only lasts a few hours, like 1 to 2 hours compared to 4-6 hours for dope, and it has only take a very small amount of fentanyl to kill someone. Fentanyl is in doses of like 25 micrograms, 50 micro, and so on, and a microgram is 1/ 1,000,000 of a gram..can't really eyeball how much to use at those small qty's.lol