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. Technical report: Hexahydrocannabinol (HHC) and related substances Harmful Effects of Vaping Chart Health Edco 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 The Safety Concerns of Cannabinoid Vaping Products