> Plastic as such is quite a inert material. Certain plastics are used for implants - there must be a good reason for it? Bioreactivity, rejection, degradation

> Plastic as such is quite a inert material. Certain plastics are used for implants - there must be a good reason for it? Bioreactivity, rejection, degradation? Those and other reasons might be a concern to be thought about in regards to inhaled plastic fibers. Not to mention if there were issues with the fibrous nature itself (like "fibrous minerals" cause certain diseases)...