What is Hexahydrocannabinol (HHC)? Does HHC Show Up on a Drug Test? (Urine, Blood & Hair Windows) HHC now illegal in Ireland: What Employers need to know Randox Testing Services Malta has officially banned the sale and distribution of HHC (Hexahydrocannabinol), a synthetic cannabinoid marketed as a legal alternative to THC. HHC emerged recently, exploiting legal loopholes, and posing significant risks to Vaping: Understanding the Risks and Impacts on Health