Tobacco is a plant whose leaves are processed and primarily used as a recreational drug. It is consumed through smoking or chewing and is a major cash crop. Men and those in developing countries or who are poor are more likely to use tobacco. Tobacco use is associated with significant health risks like cancer, heart disease, and lung disease. Over 100 million deaths in the 20th century were caused by tobacco, and it remains one of the leading causes of preventable death worldwide.