I just read this article on Medium:

https://eand.co/this-is-your-brain-this-is-your-brain-on-covid-a036f0d9f567

If you have any doubts about the importance of wearing a mask to avoid COVID, even if you are vaccinated, please read this.

Bottom line: It's not like the flu and it will never be like the flu. It destroys gray matter.

There is some ranting here, which this guy is known for, but he quotes real studies, so it's important.