6. Do you work and/or live in an environment that exposes you to chemicals like formaldehyde, formalin or harmful gases?
(The International Agency for Research on Cancer evaluated formaldehyde as carcinogenic for human in association with nasopharyngeal cancer. Formaldehyde is a colorless, highly toxic, and flammable gas at room temperature. It is used in the production of fertilizer, paper, plywood, and some resins. It is also used as a food preservative and in household products, such as antiseptics, medicines, and cosmetics.)