[mkramlich]

I could probably cite some examples of molecules where with a certain molecular structure/combination it's harmless, then you add just one more Hydrogen or Nitrogen, or whatever, and it becomes an acid.

Also consider water aka H2O. Have a sip of it and your mouth feels better. Have several cups and you're refreshed and body replenished for the day. Have 50 gallons go down your pipes and you are dead. Same molecule, phase, and microstructure. But water is extremely old and long studied and literally falling out of the sky for millions of years while humans on the planet. Not so, graphene.

Believe me, I think it's cool and sexy and do hope it enables all kinds of breakthroughs, I do. I'm just skeptical about whether it won't unleash horrible health problems down the road, due to incompetent and/or corrupt testing/approval bureaucracy, especially in the USA.