As far as I know, vaccines have some well known side effects, especially with J&J vaccine, which include blood clotting, GBS (your antibody attacks your nervous system). But, the risk of Covid far outweigh the risk of these side effects which only have occured in a few thousand among millions vaccinated. Trust me (it's a bit uncomfortable to say it here though) I have lost post covid patients from heart problems, PE (clot in the big artery that supplies blood to the lung), and now, the world famous cytokine storm. If you think the heart problem, the clots and the strokes come from vaccines, you are dangerously misinformed.