I use fentanyl on a daily basis. Quite a lot. M 30s
When I say "a lot" I mean more than most people, including other addicts, could smoke without ODing. I can quite literally smoke 80 pills in one sitting over the course of a night, inbetween nods. I've been an opiate addict since I was 16 (28 now) and some how have never fell out, but I've definitely hit more than a few people with IM Narcan that have. I'm not sure what it's like while you're in the process of ODing, but I can definitely tell you that it doesn't always appear to be a pleasant way to go, but I imagine that they were all unconscious while they were convulsing/foaming at the mouth because they NEVER have any idea what happened when they "wake up". You describe it to them and they're always amazed when they come out of it. That being said, if you have anything I can help you with in regards to heroin/fentanyl/opiates in general, feel free to ask away! I/V heroin user for about 10 years till heroin kinda died out... it has mostly been replaced with fentanyl powder and blues here in Portland, OR, which are the blue M30 pills, which I smoke instead of inject. I also smoked/snorted/injected meth for a few years till I lost my mind for a bit and flew into a drug induced psychosis that lasted for about 9 months... smoked meth on and off for a bit, but haven't for a years now because it pretty much just induces an instant panic attack nowadays. Like I said, if you have any questions, let me know!