with the vapoeizer i had i would have tons of thc leftover. it was a homemade job that didnt work to good. i have a vapzilla now and the amount i get from prefired dropped a bunch, but there is still alil bit left. i dont know how much exactly tho. when i make hash i use clipping and small popcorn buds with the prefired to make hash. ive only made prefired from my vapzilla to make hash 1 time, and it was leftovers from a party so im sure it had some unvaped bud mixxed with it.