One should not smoke as smoking is injurious to health in several ways. It increases the risk of different cancers like cancer of lung, kidney, oral cavity, larynx, pharny, bladder, kidney, esophagus, stomach. In addition to lung cancer it can cause other lung diseases like bronchitis. Smoking also increases the risk of heart diseases. In women, it can also cause cancers of cervix and vulva, and can also increase the risk of miscarriages. Therefore, its very important to quit smoking.