Sigh. Also found in a lot of food additives that break down into it (CH2O).
The formaldehyde theory of carcinogenesis was proposed in 1978.[48] In 1987 the U.S. EPA classified it as a probable human carcinogen, and after more studies the WHO International Agency for Research on Cancer (IARC) in 1995 also classified it as a probable human carcinogen. Further information and evaluation of all known data led the IARC to reclassify formaldehyde as a known human carcinogen[49] associated with nasal sinus cancer and nasopharyngeal cancer.[50] Recent studies have also shown a positive correlation between exposure to formaldehyde and the development of leukemia, particularly myeloid leukemia.[51][52] Nasopharyngeal and sinonasal cancers are relatively rare, with a combined annual incidence in the United States of < 4,000 cases.[53][54] About 25,000 cases of myeloid leukemia occur in the United States each year.[55][56] Workplace exposure to inhaled chemicals is among the most important risk factors for sinonasal cancers.[57] Professionals exposed to formaldehyde in their occupation, such as funeral industry workers and embalmers, showed an increased risk of leukemia and brain cancer compared with the general population.[58] Other factors are important in determining individual risk for the development of leukemia or nasopharyngeal cancer.[57][59][60]
https://en.wikipedia...ki/Formaldehyde
