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NCI Dictionary of Cancer Terms

tobacco-specific nitrosamine  listen  (tuh-BA-koh-speh-SIH-fik ny-TROH-suh-meen)

  A type of harmful, cancer-causing chemical found in tobacco and tobacco smoke. Tobacco-specific nitrosamines are formed when tobacco leaves are grown, cured, aged, and processed. Tobacco products can contain different amounts of tobacco-specific nitrosamines, depending on how they are made. Also called TSNA.