It is found only in cultivation, where it is the most commonly grown of all plants .
Because of this, their appearance in gardens is unpredictable from year to year. Tobacco budworms are commonly found on petunias, geraniums and nicotiana while occasionally damaging roses and other plants. The larvae damage flowers by chewing deep holes into the buds. Flowers can still emerge from these damaged buds but flowers have large holes in the petals.  Tobacco contains the alkaloid nicotine, a stimulant. Dried tobacco leaves are mainly smoked in cigarettes, cigars, pipe tobacco, and flavored shisha tobacco. They are also consumed as snuff, chewing tobacco, and dipping tobacco. Tobacco use is a risk factor for many diseases, especially those affecting the heart, liver, and lungs, and several cancers Cigarettes and other forms of tobacco—including cigars, pipe tobacco, snuff, and chewing tobacco—contain the addictive drug nicotine. Nicotine is readily absorbed into the bloodstream when a tobacco product is chewed, inhaled, or smoked.  It is typically blended with pure Virginia to lend spice, strength, and coolness to the blend. Oriental tobacco, is a sun-cured, highly aromatic, small-leafed variety (Nicotiana tabacum) that is grown in Turkey, Greece, Bulgaria, and Macedonia. Oriental tobacco is frequently referred to as Turkish tobacco, as these regions were all historically part of the Ottoman Empire It is found only in cultivation, where it is the most commonly grown of all plants in the Nicotiana genus, and its leaves are commercially grown in many countries to be processed into tobacco. It grows to heights between 1 to 2 metres. The concentration of nicotine increases with the age of the plant. Tobacco leaves contain 2 to 8% nicotine combined as malate or citrate. The distribution of the nicotine in the mature plant is widely variable: 64% of the total nicotine exists in the leaves, 18% in the stem, 13% in the root, and 5% in the flowers. 1 More nicotine is absorbed by chewing tobacco use that by smoking a cigarette. 2  Chewing tobacco use is a risk factor for the development of oral cancers and precancers. 3  Other health risks of chewing tobacco include gum disease, tooth decay and tooth loss, and possible links to other cancers and cardiovascular disease. It is available in two forms, snuff and chewing tobacco. Both types of chewing tobacco are held in the mouth inside the cheek or between the cheek and gum. Snuff and chewing tobacco are commonly available in tins or pouches; popular brand names include Skoal and Copenhagen. Distribution. Nicotiana tabacum has a tropical origin in South America and grows most efficiently in warmer climates. Tobacco shares this warm subtropical climate with black pepper. Although Nicotiana tabacum is a somewhat tropical plant it can be found as far north as Sweden and as far south as Australia.  Another element found in smokeless tobacco is nicotine. Nicotine is absorbed by the smokeless tobacco at a rate of 2 to 3 times higher than in smokers, which facilitates the rapid habituation. In addition, nicotine stays in blood for a long time. * Leukoplakia, oral lesions, which appear white spots on the cheeks, gums or tongue, which are commonly found in current smokeless tobacco products. Leukoplakia may be precancerous lesions, which can convert oral cancer. About 75 percent of daily users of smokeless tobacco will get leukoplakia. It is a green, leafy plant. In the United States the states where most tobacco is grown is within Virginia, Kentucky and central Tennessee. Some examples of Types of tobacco and where they are grown: Brightleaf tobacco, Brightleaf is commonly known as Virginia tobacco, often regardless of which state they are planted. Prior to the American Civil War, most tobacco grown in the US was fire-cured dark-leaf. Oriental tobacco, is a sun-cured, highly aromatic, small-leafed variety (Nicotiana tabacum) that is grown in Turkey, Greece, Bulgaria, and Macedonia. Tobacco is a product prepared from the leaves of the tobacco plant by curing them. The plant is categorized within the genus Nicotiana of the Solanaceae (nightshade) family. While more than 70 species of tobacco are known, the chief commercial crop is N. tabacum. Dried tobacco leaves are mainly smoked in cigarettes, cigars, pipe tobacco, and flavored shisha tobacco. They are also consumed as snuff, chewing tobacco, and dipping tobacco.
http://www.extension.umn.edu/garden/insects/find/tobacco-budworms/ https://en.wikipedia.org/wiki/Tobacco https://www.drugabuse.gov/publications/drugfacts/cigarettes-other-tobacco-products http://www.answers.com/Q/Where_is_tobacco_grown https://en.wikipedia.org/wiki/Nicotiana_tabacum http://www.medicinenet.com/smokeless_tobacco/article.htm http://bioweb.uwlax.edu/bio203/2011/vanhoof_loga/habitat.htm http://www.tobacco-facts.net/about/statistics-and-facts-on-smokeless-tobacco http://www.answers.com/Q/Where_is_tobacco_grown https://en.wikipedia.org/wiki/Tobacco
where is tobacco mostly found