Hexahydrocannabinol (HHC) use and harms in Ireland: New findings from the 2024 European Web Survey on Drugs.
The International journal on drug policy November 1, 2025 Deirdre Mongan, Nicki Killeen, Seán R Millar et al.
Hexahydrocannabinol (HHC) is a semi-synthetic cannabinoid which was marketed and sold openly in Ireland as a legal alternative to cannabis products until it was controlled in July 2025. There have been reports of psychotic illness precipitated by HHC use. Consequently, there are fears that HHC may become a public health issue. This study's aim was to measure the extent of HHC use and patterns...