[Irish Examiner] , Cunningham, Alex Synthetic cannabis driving mental health issues, warns HSE official. (04 Jun 2026)

[Oireachtas] Dáil Éireann debate. Questions 274; 275, 276 - Revenue Commissioners [vaping] [40869/26, 40870/26, 40871/26]. (28 May 2026)

[Oireachtas] Seanad Éireann debate - An tOrd Gnó - Order of Business [Synthetic cannabinoids]. (29 Apr 2026)

Mongan, Deirdre (2026) New psychoactive substances identified in Ireland 2021–2025. Drugnet Ireland , Issue 94, April 2026 , pp. 1-4.

Millar, Seán R (2026) Hexahydrocannabinol use and harms in Ireland. Drugnet Ireland , Issue 93, February 2026 , p. 32.

Millar, Seán R (2026) Hexahydrocannabinol and psychosis: trends in Ireland’s mental health landscape. Drugnet Ireland , Issue 93, February 2026 , p. 31.

Dillon, Lucy (2026) The 68th session of the Commission on Narcotic Drugs. Drugnet Ireland , Issue 93, February 2026 , pp. 12-13.

HSE Health and Wellbeing. (2025) Parents matter – vaping products & psychoactive substances: what you should know as a parent. Health Service Executive.

[Oireachtas] Dáil Éireann Debate. Question 1157 - Substance misuse [47833/25]. (17 Sep 2025)

Ireland. Department of Health. (2025) HHC (Hexahydrocannabinol). Dublin: Department of Health.

[Oireachtas] Dáil Éireann debate. Question 2728 – Misuse of drugs [HHC] [41719/25]. (29 Jul 2025)

Ireland. Department of Health. [Department of Health] Ministers for Health announce that HHC is now classified as an illegal drug. (29 Jul 2025)

[Oireachtas] Dáil Éireann debate. Question 2678 – Medicinal products [HHC] [41325/25]. (29 Jul 2025)

[Oireachtas] Dáil Éireann debate. Question 2716 – Legislative measures [HHC] [41666/25]. (29 Jul 2025)

[thejournal.ie] , Sherlock, Marie Time to face the reality of synthetic drug use among young people. (26 Jul 2025)

O'Mahony, Brian and Lanigan, Sarah and Lally, Níall and O'Malley, Andrew and Smyth, Bobby and McDonald, Colm and Hallahan, Brian (2025) Novel substance, same old problems: admissions of psychosis precipitated by hexahydrocannabinol, a widely available semi-synthetic cannabinoid. BJPsych Bulletin , pp. 1-6.

[Oireachtas] Dáil Éireann debate. Question 336 – Healthcare policy [Vapes, pouches, HHC] [38401/25]. (10 Jul 2025)

[Oireachtas] Dáil Éireann debate. Question 859 – Misuse of drugs [HHC] [37721/25]. (08 Jul 2025)

[RTE News] , Kenny, Aisling 169 young people sought treatment for HHC drug in last 18 months - Health Research Board. (30 Jun 2025)

[Limerick Post] , English, Bernie Limerick teens sent to psych wards after using legal vape substance. (26 Jun 2025)

[Oireachtas] Dáil Éireann debate. Question 1585, 1614, 1615 – Healthcare policy [HHC] [30333/25, 30523/25, 30524/25]. (10 Jun 2025)

[Oireachtas] Dáil Éireann Debate. Question 584 – Tobacco control measures [HHC vapes] [26759/25]. (27 May 2025)

[Irish Examiner] , Murphy, Ann HHC: The drug sold on Irish main streets that’s sending teens to hospital. (17 May 2025)

[Oireachtas] Dáil Éireann Debate. Question 324 – Misuse of Drugs [24971/25]. (15 May 2025)

[Oireachtas] Dáil Éireann debate. Question 203 - Health promotion [HHC products] [24020/25]. (13 May 2025)

[Oireachtas] Seanad Éireann debate. Vol. 305 No. 10 An tOrd Gnó - Order of Business [HHC products]. (07 May 2025)

[Oireachtas] Dáil Éireann debate. Question 327 – Tobacco control measures [16166/25]. (02 Apr 2025)

[Irish Times] , Bowers, Shauna Teens presenting at EDs with psychosis from legal, semi-synthentic cannabis product, says leading psychiatrist. (26 Mar 2025)

[Irish Examiner] , Murphy, Ann 'Wild West of the drug market': calls for laws to deal with synthetic cannabinoids. (10 Mar 2025)

Millar, Seán (2025) Psychotic illness triggered by widely available semi-synthetic cannabinoid. Drugnet Ireland , Issue 90, Winter 2025 , p. 15.

[Oireachtas] Dáil Éireann debate. Questions 98 & 121 - Substance misuse [10125/25]. (06 Mar 2025)

Mongan, Deirdre and Killeen, Nicki and Millar, Seán R and Matias, Joao and Keenan, Eamon and Galvin, Brian (2025) Hexahydrocannabinol (HHC) use and harms in Ireland: new findings from the 2024 European Web Survey on Drugs. International Journal of Drug Policy , 145 .

[Irish Examiner] , Dunphy, Liz Vapes with cannabinoids causing psychosis in users as young as 13. (25 Nov 2024)

College of Psychiatrists of Ireland. (2024) HHC and your mental health: information about Hexahydrocannabinol (HHC) and how it might affect your mental health. Dublin: College of Psychiatrists of Ireland.

European Monitoring Centre for Drugs and Drug Addiction, Europol. (2024) EU drug market: New psychoactive substances — Distribution and supply in Europe: semi-synthetic cannabinoids. URL: https://www.euda.europa.eu/publications/eu-drug-ma...

[Oireachtas] Dáil Éireann debate. Question 664 – Substance misuse [HHC] [17930/24]. (23 Apr 2024)

[Oireachtas] Dáil Éireann debate. Question 270 – Substance misuse [HHC hexahydrocannabinol]. (22 Feb 2024)

[Oireachtas] Dáil Éireann debate, Topical issue debate – Departmental regulations [Synthetic cannabinoid HHC]. (20 Feb 2024)

[Oireachtas] Dáil Éireann debate. Question 1499 – Misuse of drugs [cannabinoids] [56526/23]. (17 Jan 2024)

[RTE News] , Burnhill, Eleanor Arrival of synthetic drugs causing mental health concerns, says HSE. (05 Jan 2024)

Jordan, Deborah (2024) HHC/vaping: what is it? Wicklow: East Coast Regional Drug and Alcohol Task Force.

O'Mahony, Brian and O'Malley, Andrew and Kerrigan, Olan and McDonald, Colm (2024) HHC-induced psychosis: a case series of psychotic illness triggered by a widely available semisynthetic cannabinoid. Irish Journal of Psychological Medicine , 41 , (3) , pp. 405-408.

[Extra.ie] , MacNamee, Garreth ‘Legal high’ drug inhaled through a vape puts four teens in hospital. (23 Nov 2023)

European Monitoring Centre for Drugs and Drug Addiction, Europol. (2023) EU drug market: cannabis — in-depth analysis. URL: https://www.euda.europa.eu/publications/eu-drug-ma...

[Oireachtas] Dáil Éireann debate. Questions 236 - Health Service Executive [Cannabinoids in vapes] [34427/23]. (12 Jul 2023)

[Oireachtas] Dáil Éireann debate. Questions 456, 620, 621, 622 - Substance misuse [Cannabinoid vaping] [30556/23, 30553/23, 30554/23, 30555/23]. (27 Jun 2023)

European Monitoring Centre for Drugs and Drug Addiction. Ujváry, István and Evans-Brown, Michael and Gallegos, Ana and Planchuelo, Gregorio and de Morais, Joanna and Christie, Rachel and Jorge, Rita and Sedefov, Roumen (2023) Hexahydrocannabinol (HHC) and related substances. Technical report. Luxembourg: Office for Official Publications of the European Communities.

[EMCDDA] EMCDDA technical expert meeting on hexahydrocannabinol (HHC) and related cannabinoids. (19 Dec 2022)