Toluene is found in cigarette smoke. Toluene is also found in gasoline.
McKeown, N J. "Toluene Toxicity." Medscape, 01 Feb. 2015. Web.
"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.