"We found that the incidence of self-reported COVID-19 was 33% higher in those wearing face masks often or sometimes, and 40% higher in those wearing face masks almost always or always, compared to participants who reported wearing face masks never or almost never." https://www.cambridge.org/core/services/aop-cambridge-core/content/view/0525AD535D10FDCDF0C52603B50E7A1E/S0950268823001826a.pdf/association-between-face-mask-use-and-risk-of-sars-cov-2-infection-cross-sectional-study.pdf