As usual the media is not reporting specifics and is heavily engaged in their fear porn even with the vaccine.
I was under the impression that the few people with reported blood clots with the J & J brand of vaccine are all women, under 48 and all on oral birth control medication.
Blood clots are a known side effect with female birth control.
This doesn't address the possibility of long term immune dysfunction from vaccines (if that even exists), but these vaccines, even the J&J seem very, very safe.