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Drug use prevelance in Ireland: Findings from recent population studies and estimates of problem use


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Findings from recent population studies and estimates of problematic
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New estimates of problematic opioid use in Ireland, 2020–2022
by Seán Millar
Background

Problematic opioid use is a significant problem in Ireland and across the world. However, measuring
the prevalence of opioid use is challenging. Given the nature of this population, a simple head
count is not feasible and general population surveys are known to be ineffective at capturing this
‘hidden’ population. Because people who use drugs fear stigmatisation and are often marginalised in
society, the European Union Drugs Agency (EUDA) recommends the use of indirect approaches, such as
the capture-recapture (CRC) method, to estimate the prevalence of problematic (high-risk) drug
users.1



To date, one regional and four national CRC studies have been conducted in Ireland to estimate the
prevalence of problematic opioid use. These studies provided estimates for the years 1996, 2000–01,
2006, 2011–2014, and 2015–2019.2,3,4,5,6

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Drug use among 25-year-olds in Ireland: results from the GUI study
by Seán Millar
Since 2006, the Growing Up in Ireland (GUI) national longitudinal study of children and young people
has followed a cohort of children born in 1998. Five waves of interviews have been conducted with
this cohort when they were aged 9, 13, 17–18, 20, and 25 years. This article presents findings on
drug use from 3,380 interviews with the 25-year-old participants, which were conducted in 2023–24.1



Any drug use

Figure 1 shows the prevalence of illicit drug use among 25-year-olds in the GUI study. Cannabis was
the most prevalent drug, with 56.6% of respondents stating that they had ever tried it. Just over
one-fifth (21.4%) of 25-year-olds reported ever having tried cocaine, and cocaine usage in the last
year was more common for men (24.3%) than for women (18.6%). The other most commonly reported drugs
were ecstasy (10.7%), ketamine (9.7%), and magic mushrooms (6.9%).

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Cannabis use findings from the Health Behaviour in School-aged Children study, 2022
by Seán Millar
The first Health Behaviour in School-aged Children (HBSC) study was conducted in Ireland in 1998 and
has been repeated every 4 years ever since. In 2022, Ireland participated in the HBSC study for the
seventh time. The survey included a representative sample of 9,071 children drawn from primary and
post-primary schools across Ireland; 191 schools participated. Data were collected on general
health, smoking, use of alcohol and other substances, food and dietary behaviour, exercise and
physical activity, self-care, injuries, bullying, and sexual health behaviours. The main results
were published in 2025.1 This article describes results pertaining to the use of cannabis and makes
comparisons with previous HBSC studies.



Cannabis use in the last year

Overall, 6.5% of 10–17-year-olds said that they had used cannabis in the last year. The prevalence
of cannabis use increased with age, and a higher percentage of boys aged 10–14 years reported using
cannabis compared with girls (see Table 1). Almost 13% of boys and 13.4% of girls aged 15–17 years
reported having used cannabis in the last year.

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Cannabis use among Irish adolescents: risk and protective factors
by Seán Millar
Cannabis remains the most widely used illicit substance among adolescents in Ireland, with new
research shedding light on the factors that influence its use. A 2021 survey involving over 4,400
students aged 15–16 years in North Dublin, Cavan, and Monaghan revealed that 7.3% reported using
cannabis in the past month. The study, part of the Planet Youth initiative based on the Icelandic
Prevention Model, identified individual, familial, and peer-related factors related to cannabis use.



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Results from the 2023 Healthy Ireland Survey on drug use in Ireland
by Seán Millar and Deirdre Mongan
Ireland has conducted five general population surveys on drug use (2002–03, 2006–07, 2010–11,
2014–15, and 2019–20). The first four surveys were conducted simultaneously in Ireland and Northern
Ireland.1 The 2019–20 survey was conducted in Ireland only and was managed by the Health Research
Board (HRB), which commissioned Ipsos B&A to conduct this survey on its behalf.2



In 2022, the Department of Health Drugs Policy Unit and the HRB requested that questions on drug use
prevalence be included in the 2023 Healthy Ireland Survey rather than undertaking a standalone
study. Potential respondents were sampled using a two-stage telephone random digit dialling
approach. Mobile phone numbers were used, as there is almost universal ownership of mobile phones in
Ireland. Before proceeding with a telephone interview, informed consent was obtained from the
individual and parental consent was obtained for those aged under 18 years.

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Substance use among Irish 15–16-year-olds: new findings from the European School Survey Project on
Alcohol and Other Drugs, 2024
by Seán Millar
The European School Survey Project on Alcohol and Other Drugs (ESPAD) has conducted surveys of
school-going children since 1995, using a standardised method and a common questionnaire. ESPAD
Ireland 2024 was conducted in collaboration with the ESPAD Europe Coordinating Team and collected
information on the use of alcohol, tobacco, and other substances among 15–16-year-old students.



An important goal of the ESPAD is to monitor trends in substance use and compare trends between
countries and groups of countries. It also provides an opportunity to observe trends in substance
use among Irish 15–16-year-olds. The rationale for the ESPAD is that school students are easily
accessible and are at an age when the onset of substance use is likely to occur.

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