Acetaldehyde is in tobacco smoke. Acetaldehyde is a hazardous air pollutant.
"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: 179.
One cigarette company biologically engineered tobacco plants to have twice the normal level of nicotine.
"A Report of the Surgeon General." U.S. Department of Health and Human Services, Center for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Office on Smoking and Health. Other Effects. 2004: 616. Report.