I heard voices screaming in my head. It was terrifying., Figures from the Health Research Board show that since the beginning of last year, 169 young people sought treatment for problems with HHC can cause harm and is known to be addictive. For more information on the change in law and services available for anyone impacted visit gov.ie HHC Long Lasting Cognitive and Physical Impairment After Recreational Use of the Semisynthetic Cannabinoid Hexahydrocannabinonyl (HHC C9): A Case Report HHC can cause harm and is known to be addictive. For more information on the change in law and services available for anyone impacted visit gov.ie HHC Preliminary pharmacokinetic and psychophysical investigations after controlled oral and inhalative consumption of hexahydrocannabinol (HHC) Scientific Reports Harmful Effects of Vaping Chart Health Edco