Hydrogen cyanide is in tobacco smoke. Hydrogen cyanide exposure causes cardiovascular and respiratory illness.
"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.
"Medical Management Guidelines for Hydrogen Cyanide." Agency for Toxic Substances & Disease Registry. 21 Oct. 2014. Web.