Doctors believe that smoking causes lung cancer and damages cells. Additionally, when someone smokes, the effects are immediate on the lungs and other parts of the body. Smoking causes problems with the lungs, nose, mouth, liver, kidneys, stomach and affects almost every part of the body. Furthermore, tobacco smoke alters the blood and damages blood vessels. “Tobacco smoke is made up of thousands of chemicals and many of them are very harmful. About 70 of them cause cancer.” Also, by reading the above quote, everyone can understand that smoking is very harmful to health and attacks every single part of the body. Smoking causes cancers of the lungs, mouth, esophagus, nose, throat, pancreas, liver, intestines, bladder and kidneys. Furthermore, smoking also causes lung diseases such as chronic obstructive pulmonary disease. Also, heart disease, heart attack and stroke. "Smoking can dry out your skin and cause it to lose elasticity, causing wrinkles and stretch marks." Furthermore, smoking also causes DNA damage. When it damages DNA, cells grow out of control and lead to cancer. These are some health problems caused by smoking, there are many other harmful effects of smoking