actually. if you have a good way of getting a known dose of fent that you could dissolve in the liquid, im sure you could figure out a way to make this work. my thoughts are it would be similar to making up a nasal spray for a chemical. just gotta figure out how much it vapes at a time, then do the math with however much of the drug you have and viola! fent is really potent and i would be afraid to do this. for HR ill say that this has the potential to be EXTREMELY dangerous. if you have a good opiate tolerance, are experienced with fent itself, prepare it the right way, and start low i think this could work rather well.