HHC and THC, whether delta-8 or delta-9, are cannabinoids that are similar in structure and how they influence the endocannabinoid system. And, like delta-8 and delta-9, HHC is psychoactive. HHC, on the other hand, is significantly less powerful than either. Delta-9 is twice as powerful as delta-8, although HHC is substantially weaker than delta-8.