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One Is Not Enough: Understanding and Modeling Polysubstance Use. 

Crummy EA, O'Neal TJ, Baskin BM, Ferguson SM. 

Front Neurosci. 2020;14:569. Published 2020 Jun 16. doi:10.3389/fnins.2020.00569

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7309369/