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The average brain weighs 1300-1400 grams. If 0.5% of that is plastic by weight, your brain contains 6.5 - 7 grams of plastic. The average plastic credit card weighs 5 grams.
https://www.theguardian.com/environment/article/2024/aug/21/microplastics-brain-pollution-health
I'm saying the weight is, and it's not just my skull, it's everyone's skull. It's likely we're all experiencing those issues. It's also not up there in a single slab, but embedded throughout, which hopefully mitigates that issue.
A study under peer review claims those with dementia are more likely to have more plastic in their brains than the average person.
You're good, just wanted to be clear.
The bigger question is, how do these microplastics pass the blood/brain barrier?