Tobacco is a substance which people smoke in pipes, cigars and cigarettes. Tobacco refers to the dried leaves of the tobacco plant that are used for making cigarettes smoking in a pipe or chewing. Tobacco is openly used in the whole world thought it is a kind of intoxication. In tobacco, there is a kind of chemical substance called nicotine. It is a powerful poison. Even a small part of nicotine may cause death. It particularly affects mind and nerves. Tobacco smoking directly affects the lungs, heart and blood. The smoke of tobacco consists of a mixture of gasses and various vaporized chemicals including vaporized nicotine, which is a toxic and habit forming substance. All these are harmful substances to health. Among them carcinogens causes cancer and other fatal diseases too.
