I-Nicotine iyi-molecule, i-alkaloid, ayitholakali kuphela kugwayi kodwa futhi kabanzi esithelweni esidliwayo sezitshalo ze-Solanaceae ezifana notamatisi namajikijolo e-goji.Phakathi kwalezi zitshalo, ugwayi(Nicotiana tabacum) ungesinye sezitshalo ezinokuqukethwe okuphezulu kwe-nicotine,ibalwa 8% -14%, okuyisizathu futhi esenza ukuthi isetshenziswe, yomiswe, futhi ishiswe kugwayi.