nicotine

1. (organic chemistry) An alkaloid (C₁₀H₁₄N₂), commonly occurring in the tobacco plant.Examples: "She is addicted to nicotine."; "The nicotine in tobacco has been held to produce anaphrodisiac effects, in spite of such literary commendation as J.M. Barrie's My Lady Nicotine."; "The website calls a vote for Alyona a vote against "beauties who do not look natural and who cannot be distinguished from each other" and rails against the "imposed standards" of 90-60-90 vital statistics, and "cigarettes with out nicotine and coffee without caffeine"."uncountable

2. (figuratively) Tobacco or cigarettes.Examples: "He's got nicotine stains on his fingers."figurativelyuncountable