Nicotine yog ib tug molecule, alkaloid, pom tsis tau tsuas yog nyob rau hauv luam yeeb, tab sis kuj dav nyob rau hauv cov txiv hmab txiv ntoo ntawm Solanaceae cov nroj tsuag xws li txiv lws suav thiab goji berries.Ntawm cov nroj tsuag, haus luam yeeb (Nicotiana tabacum) yog ib qho ntawm cov nroj tsuag uas muaj cov ntsiab lus nicotine siab tshaj plaws, suav nrog. 8% -14%, uas kuj yog vim li cas nws thiaj li siv, qhuav, thiab hlawv hauv luam yeeb.