Lung cancer. Caused by an abnormal growth of cells in the lungs, lung cancer is a leading cause of death in the United States and is usually caused by smoking cigarettes. It starts in the lining of the bronchi and takes a long time to develop, so it's usually a disease in adults. Symptoms include a lasting cough that may bring up blood, chest pain, hoarseness, and shortness of breath. Radon gas (a gas that occurs in soil and rocks) exposure also might cause lung cancer. Radon is more likely to happen in certain parts of the United States. You can check your home's radon level with a radon kit available at your local home supply or hardware store.
A) Medial view of the lung of a domestic chicken ( Gallus gallus domesticus ). p, primary bronchus; v, ventrobronchus; d, dorsobronchus; r, parabronchi. Scale bar, 1 cm. (B) An intraparabronchial artery (i) giving rise to blood capillaries (c) in the lung of an Emu ( Dromiceus novaehollandiae ). a, air capillaries. Scale bar, 15 μm. (C) Air capillaries closely associated with blood capillaries (arrows) in a chicken lung. Scale bar, 10 μm. (D) Blood capillaries (c) closely associated with air capillaries (spaces) in a chicken lung. Scale bar, 12 μm. (From: Maina 2002).
Toluene. A petrochemical derived from petroleum or coal tar sources. You may see it on labels listed as benzene, toluol, phenylmethane, methylbenzene. Toluene is a potent solvent able to dissolve paint and paint thinner. It can affect your respiratory system, cause nausea and irritate your skin. Expecting mothers should avoid exposure to toluene vapors as it may cause developmental damage in the fetus . Toluene has also been linked to immune system toxicity. It can be found in nail polish, nail treatments and hair color/bleaching products.