The Safety Concerns of Cannabinoid Vaping Products 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 Vaping releases toxic chemicals, including heavy metals, as well as ultrafine particles that go deep into the lungs. These increase the risk of heart and lung disorders.