Yes, formaldehyde is classified as a [carcinogen](https://www.cancer.org) by several health organizations, including the International Agency for Research on Cancer (IARC) and the National Toxicology Program (NTP). It is specifically linked to nasopharyngeal cancer and leukemia. The mechanism by which formaldehyde induces cancer is not fully understood, but it is believed to involve the formation of DNA-protein crosslinks and oxidative stress.
