SEM image of asbestos fibers.People are dying on daily bases because of Cancer. Cancer has a lot of forms and one of them is The Lung Cancer. There are different reasons for lung cancer but the most important and natural cause of this dangerous disease is Asbestos fibers. Asbestos fibers are present in the air and human inhale this element while breathing. When it is inhaled, it sticks to delicate pleural membrane of lungs. Pleural membrane is a protective lining around the lungs that secure the lungs from outside threats, viruses, bacteria and germs. The microscopic asbestos fibers affect the pleural membrane; it starts to thickening and cause Pleural Thickening. If Pleural Thickening left untreated then lungs create irregular cell membrane around the fibers. The extra cell membranes form an irregular shape of mass, with the passage of time its size increases and its transform into tumor. Afterwards tumor leads to Lungs cancer and finally lung cancer leads to death.