I'm a longtime heroin and fent user. Can't get my hands on my regular products and have the opportunity to purchase a fluoro-furanyl-fent 1:5 mannitol mix (only product avail right now). Can anyone suggest an appropriate mixture that would be similar to what I currently use, which is .5g fent mixed in 40ml saline and snorted? Not sure the potency of the FFF so want to get some idea before I start fiddling with it. I do have naloxone on hand in case of an oopsie.