I agree that there is not evidence to "not worry", but many explicit worries are being accounted for.

Also - in terms of human tissue:

"The problem is that some small molecules in the fumes derived from polyethylene and PVC can also be produced from fats in human tissue. Human samples are “digested” with chemicals to remove tissue before analysis, but if some remains the result can be false positives for MNPs. Rauert’s paper lists 18 studies that did not include consideration of the risk of such false positives." (https://www.theguardian.com/environment/2026/jan/13/micropla...)

and Rauert's paper (https://pubs.acs.org/doi/10.1021/acs.est.4c12599)