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Here's an article from 2020 about micro plastics being a carcinogen https://www.sciencedirect.com/science/article/abs/pii/S0304389420309833
Here's another that goes over individual chemicals that may leech out of them https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7068600/
That's just a few things from a search. There are already known impacts and we understand the mechanisms.
I want to begin by saying I am not dismissing concerns about microplastics in placentas. That's fucked up.
However, lots of things "are carcinogens". It's the dose that makes the poison.
Yeah, and carcinogens typically screw with DNA. So even a tiny dose will cause greater impacts on a fetus both as a greater concentration than the same dose would be for an adult and as damage to DNA will replicate exponentially more times than they would in an adult.
I admit I'm not a doctor, but the chance of petrochemicals in the placenta having no health impact sounds very unlikely.
No health impact is surely an overstatement, but I have to wonder how long it's been going on. They say that aerosolized rubber from car tires is a contributor, and we've been driving for a hundred years. Plastic packaging has been in wide use since the 50s. Surely there is a health impact but it's also been going on long enough that we must know our bodies tolerate it at least somewhat.
I've taken to using silicone instead of plastic bags in my house to minimize my exposure, but I live next to a busy street so I feel kinda hosed.
Big changes in quantity! I suspect a small amount is well tolerated, but we are exposed to far more. We are also seeing more exposure over ones lifetime.
We also don't know what number of on-the-rise conditions can be attributed to it. We don't know the full impact, but seems safe to suggest reducing exposure through regulation.