This is an academic paper that presents the results of a survey to those with substance use disorder, along with those in remission, and their families on the impact of COVID-19. Those with a history of using multiple substances reported greatest disruption in services, suggesting that polysubstance users may be at greater risk during the coronavirus pandemic.
Mellis, A.M., Potenza, M.N., Hulsey, J.N. (2020). COVID-19-related treatment service disruptions among people with single- and polysubstance use concerns. Journal of Substance Abuse Treatment, Epub ahead of print. doi: 10.1016/j.jsat.2020.108180