Iv never been into hydrocodone, heroin was my doc. But i noticed at doses of 4mg up it’s hard to get high without waiting atleast 36hr. At times I would take 8mg sub then the next day I would try to smoke 1-2g of bth and get almost nothing, I think anything I felt was placebo...imo before you start messing with subs do as much research as you can on them and how to get off them(without going back to full agonist). I’m currently tapering and at .63mg a day, have to dissolve the strip in water to dose that low