lung cancer is caused by smoking: Lung cancer is a disease of uncontrolled cell growth in tissues of the lung. This growth may lead to metastasis, which is the invasion of adjacent tissue and infiltration beyond the lungs. The vast majority of primary lung cancers are carcinomas of the lung, derived from epithelial cells. Lungcancer, the most common cause of cancer-related death in men and women, is responsible for 1.3 million deaths worldwide annually, as of 2004.[1] The most common symptoms are shortness of breath, coughing (including coughing up blood), and weight loss.[2]

The main types of lung cancer are small cell lung carcinoma and non-small cell lung carcinoma. This distinction is important, because the treatment varies; non-small cell lung carcinoma (NSCLC) is sometimes treated with surgery, while small cell lung carcinoma (SCLC) usually responds better to chemotherapy and radiation.[3] The most common cause of lung cancer is long-term exposure to tobacco smoke.[4] The occurrence of lung cancer in nonsmokers, who account for as many as 15% of cases,[5] is often attributed to a combination of genetic factors,[6][7] radon gas,[8]asbestos,[9] and air pollution,[10][11][12] including secondhand smoke.[13][14]

Lung cancer may be seen on chest radiograph and computed tomography (CT scan). Thediagnosis is confirmed with a biopsy. This is usually performed by bronchoscopy or CT-guided biopsy. Treatment and prognosis depend upon the histological type of cancer, the stage (degree of spread), and the patient's performance status. Possible treatments include surgery,chemotherapy, and radiotherapy. Depending on the stage and treatment, the five-year survival rateis 14%.[2]

"Second hand smoke" redirects here. For the Sublime album, see Second-hand Smoke.

Tobacco smoke in an Irish pub before a smoking ban came into effect on March 29, 2004

Passive smoking is the inhalation of smoke, called secondhand smoke (SHS) or environmental tobacco smoke (ETS), from tobacco products used by others. It occurs when tobacco smoke permeates any environment, causing its inhalation by people within that environment. Scientific evidence shows that exposure to secondhand tobacco smoke causes disease, disability, and death.[1][2][3][4]

Passive smoking has played a central role in the debate over the harms and regulation of tobacco products. Since the early 1970s, the tobacco industry has been concerned about passive smoking as a serious threat to its business interests;[5] harm to "innocent bystanders" was perceived as a motivator for stricter regulation of tobacco products. Despite an early awareness of the likely harms of secondhand smoke, the tobacco industry coordinated to engineer a scientific controversy with the aim of forestalling regulation of their products.[6] Currently, the health risks of secondhand smoke are a matter of scientific consensus, and these risks have been one of the major motivations for smoking bansin workplaces and indoor public places, including restaurants, bars and night clubs.

The term thirdhand smoke was recently coined to identify the residual tobacco smoke contamination that remains after the cigarette is extinguished and secondhand smoke has cleared from the air.[7][8][9]Preliminary research suggests that byproducts of thirdhand smoke may pose a health risk,[10] though the magnitude of risk, if any, remains unknown.

"Second hand smoke" redirects here. For the Sublime album, see Second-hand Smoke.

Tobacco smoke in an Irish pub before a smoking ban came into effect on March 29, 2004

that is why smoking is harmful!

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