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Higgins, Kathryn and O'Neill, Nina and O'Hara, Leeanne and Jordan, Julie-Ann and McCann, Mark and O'Neill, Tara and Clarke, Mike and O'Neill, Tony and Kelly, Grace and Campbell, Anne (2021) New psychoactives within polydrug use trajectories-evidence from a mixed-method longitudinal study. Addiction , 116 , (9) , pp. 2454-2462.