High on Trapper
Your two-questions are a bit of a double-edged sword, but there may very well be a "detoxified" version of charcoal for the face.
"
And if charcoal is really that big of a threat, why does the FDA allow people to charcoal broil steaks on a grill in the USA?"
They don't call them the
Federal
Death
Administration for nothing.
"
What are the chances I going to get eye lid cancer from using artist charcoal as eye shadow?"
IMO, it depends on how cleaned up the charcoal is...
Just my two cents...
Perhaps you can post the specific ingredients in your charcoal? OH, 'artist charcoal' - yeah, it won't have an ingredient list, it's not for consumption.
sigh
If the smart guys here deem it safe, take a picture. I got an eye-lid problem myself!