Millar, Seán (2025) New estimates of problematic opioid use in Ireland, 2020–2022. Drugnet Ireland , Issue 92, Autumn 2025, Supplement , pp. 2-7.

Mongan, Deirdre and Millar, Seán (2025) Results from the 2023 Healthy Ireland Survey on drug use in Ireland. Drugnet Ireland , Issue 92, Autumn 2025, Supplement , pp. 8-13.

Millar, Seán (2025) Substance use among Irish 15–16-year-olds: new findings from the European School Survey Project on Alcohol and Other Drugs, 2024. Drugnet Ireland , Issue 92, Autumn 2025, Supplement , pp. 13-15.

Millar, Seán (2025) Drug use among 25-year-olds in Ireland: results from the GUI study. Drugnet Ireland , Issue 92, Autumn 2025, Supplement , pp. 16-17.

Millar, Seán (2025) Cannabis use findings from the Health Behaviour in School-aged Children study, 2022. Drugnet Ireland , Issue 92, Autumn 2025, Supplement , pp. 17-19.

Millar, Seán (2025) Cannabis use among Irish adolescents: risk and protective factors. Drugnet Ireland , Issue 92, Autumn 2025, Supplement , p. 19.