This is an academic paper that shows that the coronavirus pandemic exacerbated the opioid crisis in San Francisco. Emergency departments saw approximately 2.5 patients per day with opioid overdose compared with 1.4 patients per day prior to this period, and 8, there were 1.47 deaths per day due to overdose compared with 0.95 deaths per day prior to this period
Rodda, L.N., West, K.L., LeSaint, K.T. (2020). Opioid Overdose-Related Emergency Department Visits and Accidental Deaths during the COVID-19 Pandemic. Journal of Urban Health. Epub ahead of print. doi: 10.1007/s11524-020-00486-y