1.

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

2.

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

3.

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

4.

[Article] Duddy, Claire (2025) What are synthetic drugs? House of Commons Library Insight,

5.

[Article] 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. 10.1192/bjb.2025.85

6.

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

7.

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

8.

[Report] Public Health Scotland. (2025) Rapid Action Drug Alerts and Response (RADAR) quarterly reports 2025. Edinburgh: Public Health Scotland.

9.

[Report] Western Region Drug and Alcohol Task Force, Planet Youth. (2025) Growing up in the west: Planet Youth report 2025: County Mayo. Galway: Western Region Drug and Alcohol Task Force.

10.

[Report] Western Region Drug and Alcohol Task Force, Planet Youth. (2025) Growing up in the west: Planet Youth report 2025: County Roscommon. Galway: Western Region Drug and Alcohol Task Force.

11.

[Report] Western Region Drug and Alcohol Task Force, Planet Youth. (2025) Growing up in the west: Planet Youth report 2025: Galway city. Galway: Western Region Drug and Alcohol Task Force.

12.

[Report] Western Region Drug and Alcohol Task Force, Planet Youth. (2025) Growing up in the west: Planet Youth report 2025: Galway county. Galway: Western Region Drug and Alcohol Task Force.

13.

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

14.

[Article] Cozier, Gyles E and Gardner, Matthew and Craft, Sam and Skumlien, Martine and Spicer, Jack and Andrews, Rachael and Power, Alexander and Haines, Tom and Bowman, Richard and Manley, Amy E and Sunderland, Peter and Sutcliffe, Oliver B and Husbands, Stephen M and Hines, Lindsey and Taylor, Gillian and Freeman, Tom P and Scott, Jennifer and Pudney, Christopher R (2025) Synthetic cannabinoids in e-cigarettes seized from English schools. Addiction, Early online. https://doi.org/10.1111/add.70110

15.

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

16.

[Article] Sharma, Rishi and Weinstein, Aviv (2025) Synthetic cannabinoid withdrawal: a systematic review of case reports. European Addiction Research, Early online. pp. 1-17. https://doi.org/10.1159/000546633

17.

[Article] Storck, Wilhelm and Elbaz, Meyer and Vindis, Cécile and Déguilhem, Amélia and Lapeyre-Mestre, Maryse and Jouanjus, Emilie (2025) Cardiovascular risk associated with the use of cannabis and cannabinoids: a systematic review and meta-analysis. Heart, Early online. https://doi.org/10.1136/heartjnl-2024-325429

18.

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

19.

[FactSheet] HRB National Drugs Library. (2025) Factsheet: New psychoactive substances (NPS) - the Irish situation. Dublin: HRB National Drugs Library.

20.

[Webpage] Center for Forensic Science Research and Education. (2025) CSFRE new psychoactive substances (NPS). Scope recommendations. URL: https://www.cfsre.org/nps-discovery/scope-recommen...

21.

[Report] European Union Drugs Agency. (2025) Drug-induced deaths – the current situation in Europe (European Drug Report 2025). Lisbon: EUDA.

22.

[Report] European Union Drugs Agency. (2025) Harm reduction – the current situation in Europe (European Drug Report 2025). Lisbon: EUDA.

23.

[Report] European Union Drugs Agency. (2025) New psychoactive substances – the current situation in Europe (European Drug Report 2025). Lisbon: EUDA.

24.

[Report] European Union Drugs Agency. (2025) Understanding Europe’s drug situation in 2024 – key developments (European Drug Report 2025). Lisbon: EUDA.

25.

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

26.

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

27.

[FactSheet] National Drug and Alcohol Research Centre. (2025) NDARC fact sheet: cannabis. Sydney: National Drug and Alcohol Research Centre.

28.

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

29.

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

30.

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

31.

[Report] Advisory Council on the Misuse of Drugs. (2025) ‘Semi-synthetic’ cannabinoids: cannabinoids related to tetrahydro- cannabinol and cannabidiol. London: Advisory Council on the Misuse of Drugs.

32.

[Webpage] HSE drugs.ie. (2025) Drug trend updates and warnings. URL: https://www.drugs.ie/drugs_info/drug_trend_updates...

33.

[News] [Independent.ie] , O'Regan, Eilish Crackdown on legal semi-synthetic cannabis planned, but no public information campaign on risks. (25 Apr 2025)

34.

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

35.

[Dail Debates] [Oireachtas] Dáil Éireann debate. Questions 341, 691 – Cannabis for medicinal use [Cannabinoids] [16274/25, 15652/25]. (02 Apr 2025)

36.

[Webpage] Center for Forensic Science Research and Education. (2025) Novel psychoactive substances (NPS) trend reports. URL: https://www.cfsre.org/nps-discovery/trend-reports

37.

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

38.

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

39.

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

40.

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