https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8395971/
Analysis of the Effects of COVID-19 Mask Mandates on Hospital Resource Consumption and Mortality at the County Level
Conclusion: Masks. Do. Not. Work.
At least not for the purposes claimed. But they are a great virtue-signaling and compliance device.
Merely anecdotal evidence. Move along and mask up..