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 Technical report: Hexahydrocannabinol (HHC) and related substances Harmful Effects of Vaping Chart Health Edco Health Effects of Vaping Smoking and Tobacco Use CDC Vaping harmless. Chemicals like formaldehyde, arsenic, lead, chromium, and nickel are found in vape aerosol. They damage lungs. They harm developing brains. They raise cancer risks. Protect