Masks Containing Graphene recalled in March this year – and recently reinstated.   Canada issued a recall stating that Graphene could cause lung damage.

https://www.cbc.ca/news/canada/new-brunswick/health-canada-disposable-1.5974867

However, this was then retracted

https://montreal.ctvnews.ca/after-recalling-graphene-coated-masks-out-of-safety-concerns-health-canada-says-some-models-can-come-back-on-the-market-1.5509111

It’s interesting to note that The Department did not find evidence that biomass graphene provides any added antimicrobial, or antiviral protection. Which begs the question “Why is the graphene in there then?”