Nicotine wani kwayoyin halitta ne, alkaloid, wanda aka samo ba kawai a cikin taba ba, har ma a cikin 'ya'yan itatuwa na Solanaceae masu cin ganyayyaki irin su tumatir da goji berries. Daga cikin tsire-tsire, taba (Nicotiana tabacum) yana daya daga cikin tsire-tsire masu yawan nicotine, lissafin kuɗi. 8% -14%, wanda kuma shine dalilin da yasa ake amfani da shi, bushewa, da ƙonewa a cikin sigari.