Identify the cause and effect relationship of smoking and lung cancer:

A case study: LUNG CANCER: Definition: Uncontrolled growth of tumours in the lungs Causes: There is a obvious link between smoking and lung cancer. Tobacco smoke contains many carcinogens such as benzene Effect: As the tumour grows, the air sacs in the lungs are destroyed and breathing becomes difficult. The lungs collapse and abscess and the patient may begin coughing up blood Statistical Information: - Mass production of cigarettes began in 1880 - free cigarettes were …

…lung cancer. - In the 1970s, as the numbers of female smokers began to increase, lung cancer became the number one cause of cancer death. - Studies have shown a correlation between the number of cigarettes smoked each day and the risk of contracting lung cancer at an earlier stage * Also, a gradual decrease in the numbers of people smoking in the past 20 years has been mirrored by a decrease in sufferers of lung cancer