So about 6 months ago i changed my primary drug from heroin to fentanyl. initially my fent dose was 5-7 mg per shot. i would mix in a tiny bit of heroin too to keep the legs people say fent lacked. As the time passed, though my fent dose per shot increased due to tolerance, i found that I did less and less doses per day. here we are today, my daily intake of opiates is down to 1 injection per 24-30 hours. The amount of fent in this injection is about 30mg, but otherwise, it keeps me well enough to where i never feel sick. even when i do my next dose i havent gotten sick yet. there have been a couple instances where i forgot to dose for about 36 hours and i think i started feeling WD but not sure because the anxiety wasnt there as i had product i just was busy with other things and forgot to dose, but i started sweating a lot and gotearly wd symptoms. it seems that with fent i need to wait about 36 hours to get wd that take about 12 -14 hours with heroin. please explain why. my only thought is my fent dose is so high, that even with a short halflife, 30mg to get expelled to a point where im sick is this thinking right? if so why didnt it work this way with heroin when my tolerance went up?