<Li> White burley air - cured leaf was found to be more mild than other types of tobacco . In 1865, George Webb of Brown County, Ohio planted red burley seeds he had purchased, and found a few of the seedlings had a whitish, sickly look, which became white burley . </Li> <Li> Wild tobacco is native to the southwestern United States, Mexico, and parts of South America . Its botanical name is Nicotiana rustica . </Li> <Li> Y1 is a strain of tobacco cross-bred by Brown & Williamson in the 1970s to obtain an unusually high nicotine content . In the 1990s, the United States Food and Drug Administration used it as evidence that tobacco companies were intentionally manipulating the nicotine content of cigarettes . </Li> <Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (May 2008) (Learn how and when to remove this template message) </Td> </Tr> </Table>

What state has been the tobacco-growing center of the united states since the 19th century