Fact
An ingredient in mothballs- naphthalene- is also found in cigarette smoke.
Source 1:
"Smoking and Tobacco Control." U.S. Department of Health and Human Services, Public Health Service, National Institutes of Health, National Cancer Institute. Risks Associated with Smoking Cigarettes with Low Machine-Measured Yields of Tar and Nicotine. Oct. 2001.
http://cancercontrol.cancer.gov/tcrb/monographs/13/m13_complete.pdf
Source 2:
"Naphthalene in Moth Balls and Toilet Deodorant Cakes." New South Wales Government Department of Health. Jan. 2011.
http://www.mhcs.health.nsw.gov.au/publication_pdfs/8780/DOH-8780-ENG.pdf