noun. the dried leaves of the Nicotiana tabacum plant and other Nicotiana species, that are sniffed, chewed, or smoked for their stimulating effects. The primary active ingredient is nicotine. The leaves additionally include volatile oils, that give its attributed scent and flavor. Tobacco was utilized by the native tribes of North and South America whenever the first European explorers came to America and was rapidly transplanted to plantations and gardens all over the world.
TOBACCO: "Contrary to the beliefs of some people, tobacco possesses no therapeutic qualities."