https://pubs.rsc.org/en/content/articlelanding/2019/nh/c8nh00318a
Graphene has been found in face masks and there is no safe amount whatsoever. It is highly carcinogenic. Read the link below too, it has links to the dangers of graphene.
https://psychictarotreadingwithalexfulford.blogspot.com/2021/08/graphene-in-medical-use.html
Scientists studied 12 face masks in the link below. We will have to wait and see what happens in the years to come.