It could easily turn out to be a not very severe problem, like "Use rayon instead of polyester for your clothing" or "No more styrofoam, because styrene monomer

It could easily turn out to be a not very severe problem, like "Use rayon instead of polyester for your clothing" or "No more styrofoam, because styrene monomer offgassing in your lungs"; The issue is that without a lot of dedicated study (probably animal studies into the millions of individual-exposure-years) we wouldn't even know. These things are too ubiquitous in modern life to readily separate them from us with careful non-experimental study design.