Sweet tobacco (Nicotiana alata) belong to the Solanaceae (the Eggplant family). It is a perennial herb that is native to southern South America, Argentina, Uruguay, Paraguay and Brazil. This herb grows up to 90 cm in height. The leaves are medium green, ovate, thick, slightly wavy to crinkled, very pubescent and sticky, and scented when bruised. The flowers are verious colored, pink, red, lavender, lime, yellow, and creamy-white. They are on thin pedicels, in terminal and lateral open inflorescences, and have a slight fragrance, enhanced at the time of evening dew. This plant widely grown as an ornamental plant for its sweet-smelling flowers, it has also occasionally been cultivated, especially in Iran and Brazil, for the production of smoking tobacco.