IV of course trumps all other ROAs because it has a BA of 100% with H. In my experience using H every ROA except plugging and IM, smoking is the next best way.. Both IV and smoking it are extremely addicting! Smoking it, I always used foil and a tube of some sort, like a hollow pen or a straw.. then you light the foil underneath and chase the H as it slides down the foil, while holding it at an angle.. the steeper the angle the faster it will slide usually, and the bigger the hit may be.. its all in the technique with this ROA aka Chasing the Dragon.. IT works way better with tar, and from what I have heard the European base heroin.. that is actually meant to be smoked.. But I have smoked powder H before both white and tan/beige ECP, with a drop of water added to it, it slides a lot better.. idk if this is true, but have heard on here adding a crushed up caffeine pill can help too, to make the dope slide.. It is very important to get this technique of chasing the dope on foil down pat, before wasting it, by coughing it all up.. which can EASILY happen if your not careful.. Also sniffing.. that is another decent ROA, I have had good results sniffing the right ECP, before I got into IV more and more, until that eventually became my ROA of choice and I couldn't make myself do it any other way.. Now I haven't plugged dope before, but I can say I have plugged other opis, like oxycodone, which was amazing when plugged.. also suboxone and subutex are pretty awesome when plugged at low doses IMO. Be super careful with H these days, people including many I knew and were friends with have been dropping like flies around my town, from fent dope... its going around, and its everywhere! It is always a good idea to take a small test bump, before jumping into doing like a 0.5G in one shot or something like that, just to make sure its legit dope, without fentanyl in it.. you should be able to tell, from what I have heard.. its unmistakeable to most people who have experience with opioids, like heroin and other pharms.. Some people don't know the difference, and should definitely be wary of what source they use for their dope.. very wary!