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
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The conclusion of that study:
“Our findings suggest that wearing a face mask may be associated with an increased risk of infection. However, it is important to note that this association may be due to unobservable and non-adjustable differences between those wearing and not wearing a mask. Therefore, caution is imperative when interpreting the results of this and other observational studies on the relationship between mask wearing and infection risk. Recommendations to wear face masks in the community are largely informed by low certainty evidence from observational studies.”