Tobacco smoking has been practiced for thousands of years and involves burning tobacco leaves and inhaling the smoke. While tobacco originated in the Americas, it spread to Europe and Asia in the 17th century. Tobacco smoking can cause various diseases such as lung cancer, heart disease, and chronic bronchitis. Over 25 diseases are caused or exacerbated by smoking. The World Health Organization works to implement tobacco control policies through the WHO Framework Convention on Tobacco Control to reduce both the supply and demand of tobacco products globally.