I would just like to reiterate, all the ones I have tried have scared the shit out of me. Ab-Fubinaca is the only one I wanted to repeat, and not many times at all. The last dose I was literally hurtling through cannibinoid hyperspace without any tracks or direction after 3 tokes of a pure small joint - to answer the question of s poster above, that is pretty darn potent in my book. And this is coming from someone who has taken a lot of supposedly much stronger psychedelics. These scare me, and I cannot recommend them to anyone. Just as my abuse of white widow skunk cannabis likely caused damage to my brain in late teens, so these have the real potential to screw up brains, particularly young ones. Please exercise extreme caution, if possible avoiding altogether. Not one to say never but I don't think never is a harmful option in this case. But if you are going to use them, be aware of extreme potency. Again, 3 tokes of BB-22 left me holding onto my seat. Woah......