Polysubstance use in early adulthood and associated factors in the Republic of Ireland: An analysis of a nationally representative cohort. - Brennan MM; Mongan D; Doyle A; Millar SR; Cavallaro M; Zgaga L; Smyth BP; Nixon E; Ivers JH; Galvin B; Walsh C; McCrory C; et al. (Addiction (Abingdon, England), 2026)