In the 740 patients looked at in this study which was just published in a JAMA Network Open research letter, the researchers concluded that a small but substantial minority of these relatively youngish patients (average age: 49) suffered from “a relatively high frequency of cognitive impairment several months after” their infection.
These impairments included “impairment in executive functioning, processing speed, category fluency, memory encoding, and recall”, and were especially prominent in those people who had been hospitalized.
Now one could argue that perhaps there is some pre-existing impairment in cognition in those people who refuse vaccination and risk infection instead, given the overwhelming evidence that compared to getting infected with SARS-Co-V2, vaccination leads to a lower risk of nearly every (probably every one, but I will leave this a bit vaguer because there is a very small chance that someone will come up with a complication that is higher for vaccination than for infection, although I doubt it very much).
That possibility aside, yet another thing that those who refuse vaccination risk coming down with.
This should be a no-brainer (actually, it is): compared to infection, vaccination is much much much the lower-risk choice.