There have been attempts to find correlations between levels of self-reported mask wearing and impact: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9123350/ ht

There have been attempts to find correlations between levels of self-reported mask wearing and impact: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9123350/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9123350/ These findings indicate that countries with high levels of mask compliance did not perform better than those with low mask usage. There are literally no correlations anywhere to be found. No impact on case numbers (the goal!) and no link between compliance and outcomes. That's because masks cannot stop an aerosolized gas from entering the body, it just goes through or around them. Aerosolized agents can also enter you via the eyeballs, which is why real gas masks also protect the eyes: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9631193/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9631193/ Especially easy for SARS-2 because the cornea has the ACE2 receptors the virus uses to enter cells: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7293510/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7293510/ This sort of thing is why masks have no effect and at first health officials said that. They were right. But governments wanted to do something, and that was something, so public health "scientists" swiftly fell into line and overnight "the science" was suddenly saying the opposite.