Nikotine ni molekile, alkaloide, iboneka mu itabi gusa ahubwo inaboneka cyane mu mbuto ziribwa z’ibiti bya Solanaceae nk'inyanya n'imbuto za goji. Muri ibyo bimera, itabi (Nicotiana tabacum) ni kimwe mu bimera bifite nikotine nyinshi, bingana 8% -14%, ari nayo mpamvu ituma ikoreshwa, yumye, kandi igatwikwa mu itabi.