Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Tobacco is an agricultural product processed from the leaves of plants in the genus Nicotiana. It can be consumed, used as a pesticide and, in the form of nicotine tartrate, used in some medicines, though it is most commonly used as a drug. In consumption it most commonly appears in the forms of smoking, chewing, snuffing, or dipping tobacco. Because of the powerfully addictive properties of nicotine, tolerance and dependence develop. Learn more about the tobacco, its history, cultivation, products and their effects on health, in this book.