Toluene is found in cigarette smoke. Toluene is also found in explosives.
"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
US Environmental Protection Agency."Explosives." Organic Chemical Process Industry. 1.http://www.epa.gov/ttn/chief/ap42/ch06/final/c06s03.pdf