You answered your own question, however, I will answer for other readers that may have the same question. Yes the H will be blocked for the most part ( >90% ), especially on 10mg bupe. Fentanyl and it's analogues generally aren't, and most H nowadays contains some fent. What you're going thru is a psychological game of cat and mouse. I've been thru it countless times. Just going thru the motion of picking up and smoking can be enough to relieve restlessness and get one started to get ready for bed, even if the drug itself isn't doing all that much at the time due to the bupe. You did good spending that money on something else other than dope except for the 1 bag but think of it this way. This cycle will continue. I used H a bunch and then CT'd and eventually started dosing 0.5-2mg bupe in the mornings for about a year before CTing off that so my situation is different but not entirely. I mostly abused the bupe due to preferring its long lasting and subtle effects over H. But there was a period of time where I was going back and forth about 30-40 a day of H and a half sub on off days, all IV. I guess one could say that I fucked myself over because each time you go back and forth between the sub and the H, the sub eventually becomes less effective. It sounds like its your first time using bupe? You need to either switch over for good (with a taper planned in a couple months) or just remain in this limbo zone, or cold turkey. There is not many other paths for you to take that won't result in a prolonged and seemingly endless misery.