Cigarette smoking is the practice of burning tobacco and inhaling the resulting smoke through a cigarette. Cigarettes are typically made of finely cut tobacco leaves that are rolled into a paper cylinder. The tobacco is lit at one end, and the smoker inhales the smoke through the other end.
Cigarette smoking is one of the leading causes of preventable death in the world. It is responsible for numerous health problems, including cancer, heart disease, and stroke. Cigarette smoke contains over 7,000 chemicals, many of which are known carcinogens. These chemicals damage the DNA of cells, which can lead to cancer. Cigarette smoke also damages the heart and blood vessels, which can lead to heart disease and stroke.