Cigarette smoke contains about 7,000 chemicals.
"The Health Consequences of Smoking—50 Years of Progress. A Report of the Surgeon General." U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Office on Smoking and Health. Other Specific Outcomes, 2014. Report.http://www.surgeongeneral.gov/library/reports/50-years-of-progress/sgr50-chap-10.pdf