It took me a long time of IV'ing other opiates before heroin. The first time I did IV heroin i was a little disappointed because it was nowhere near as strong a rush as IV hydro or hone, IMO. I did end up switch from oxy/dilaudid to heroin tho for economic reasons. And after close to six months of sobriety I insulated two bags of heroin and man the high was great but so short lived. Overall I think opiates are horrific, but I would gladly say that IV is the only way to go for opiates. The opiates that can be IVd and properly filtered that is. Insufflating heroin just left an odd scent in my nose. I don't think I would use heroin again because I'm tired of living In NA and AA after binges. But if I ever got the option to smoke heroin freebase, I would totally try it.