Toluene is found in cigarette smoke. Toluene is also found in gasoline.
McKeown, N J. "Toluene Toxicity." Medscape, 01 Feb. 2015. Web.http://emedicine.medscape.com/article/818939-overview
"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