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@greentricky
Cochrane recently updated their review of the effectiveness of masks with the broad finding the evidence suggested little to no difference compared to no mask. However, major caveats that most of the studies are weak or have methodology issues, hard to design good studies in a pandemic, N95 should be more effective but their wasn't the evidence in relation to Covid to allow them to state that, personal risk is important and if you are vulnerable masks should be one layer of your protection measures
This has a good overview
https://www.health.com/cochrane-review-do-masks-work-7112631
Obviously anti-vaxers and anti-lockdown people have come out saying it is conclusive proof they don't work and we were duped and ignore all the authors caveats and list of limitations of the study