The long term what?

A year is considered "long term" when talking about vaccines (https://www.bbc.com/news/health-60468900).

mRNA vaccines have been used in oncology for almost a decade with no long term side effects seen.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7956899/

https://clinicaltrials.gov/ct2/show/NCT01684241

In addition, billions of doses have been given so far, so any long-term side effect must be less than one in a billion if it hasn't cropped up yet.

The mRNA you receive in an mRNA vaccine is gone within days.

The rest is just your regular immune system at work. And from that, we know that there is no way that problems would suddenly start appearing years afterwards. Because that's just not how immune systems work.

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