Lately I’ve been noticing people saying “the vaccines only stays in the body for like 6 months, so it won’t affect me in the long term” - I’m assuming this is not true and the the vaccine doesn’t just eventually leave the body?
It's more that the effects of the vaccine can last longer. It's like how, when you get glandular fever, it can mess you up for a long time, even though the original infection is gone. Tick infections are another super common one where you can see long lasting effects.
So in the case of the covid vaccine what can happen is you might get heart inflammation, this leads to scar tissue in the heart which weakens the heart. This is basically permanent. If you stress the heart in future you might have a heart attack.
Or, you may get clotting from the vaccine. This cuts off oxygen to part of your brain or to some of your nerves and you end up with neurological damage because the cells which were oxygen starved died. So you might see something like bells palsy. Thankfully the body is amazing and so nerves can reroute and brain can adapt to an extent. But the effects are long lasting and people won't go back to the full function they had before.
Another concerning one is fertility. A lot of women reported period issues, and biodistribution studies in rodents showed that the vaxx spike protein accumulated in the ovaries. Fertility effects would take years to show up. Then if there is any impact on offspring (since women have all our eggs - what if the egg DNA is damaged and this is passed on to our baby?) that would take even longer to show up.
Pfizer has form. They recently made a cow vaccine where the babies born to the cows had some horrible bleeding disease. This is a company on record, charged multiple times, repeat offender, and people are willing to trust them.
There is also the fact that the vaccine seems to mess up some people's immune systems for a period after they get it. So if you get any disease during this time (or cancer) then it would be more severe than it otherwise would have been. This could have long term effects etc.