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Unless there is something special about carbon chains, ingesting them is probably like ingesting activated carbon. Ingested activated carbon is part of a treatment for poison. https://en.m.wikipedia.org/wiki/Activated_carbon

Inhaling it though, is a really bad idea.

Well yeah it's a whole different shape (very pointy and can penetrate or shred cell membranes), and the electrical properties of graphene can be pretty weird.

Not the same but some people have experimented with C60 spheres. Apparently it is either very good or it increases ROS reactive oxygen species depending on who you ask and how it is prepared

Probably nothing, just like microplastics.