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me_irl
(feddit.org)
All posts need to have the same title: me_irl it is allowed to use an emoji instead of the underscore _
It not a known carcinogen. It is in group 2B from the IARC, labeled as possibly carcinogenic. There is some evidence that it might cause cancer, but not enough to say with certainty.
The scale is based on levels of evidence, not severity. Group 1 known carcinogens includes many things from Plutonium to alcohol and processed meat. Rankings are by evidence, not dosage.