What Is HHC? What You Need To Know HHC (Hexahydrocannabinol) Cannessentials You might have heard of HHC (hexahydrocannabinol) showing up in vapes, gummies, and herbal mixes. It can feel a bit like cannabis, but because it's unregulated the strength and risks Synthetic cannabinoid HHC or Hexahydrocannabinol has been classified as an illegal drug by the Government. This means that the import, export, production, possession, sale and supply of products containing the man made substance