Fact
Carbon monoxide is in tobacco smoke. Carbon monoxide is a toxic gas which can cause death.
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. 19 Nov. 2001: 185.
http://cancercontrol.cancer.gov/brp/tcrb/monographs/13/m13_complete.pdf
Source 2:
"Carbon Monoxide's Impact on Indoor Air Quality." United States Environmental Protection Agency. 05 Jan. 2016. Web.
http://www.epa.gov/indoor-air-quality-iaq/carbon-monoxides-impact-indoor-air-quality