I would be more concerned about asbestos-like reactions with the mesothelium. I know graphite doesn’t cause problems (my dad had a pencil lead embedded in his arm since he was ten, and that never led to anything), but I’m curious about how the structure of graphene might promote a reaction.
Graphene is very different from graphite.
Holy Moly.
How did he get he pencil lead embedded in his arm?
A girl hit me with her purse when I was about age 10 and I got the lead stuck deep into my right shoulder. While in the navy it worked its way out.