Lung Cancer, like all forms of cancer, is a terrible disease. It leaves its victims in so much pain and throws away their quality of life. It is caused through a variety of ways, the most popular one being tobacco smoking. Not surprising, considering the vast amount of people across the world who smoke. Less commonly known causes include exposure to petroleum gases you tend to inhale when at a filling station, exposure to asbestos and consistent exposure and/or inhalation of smog like that of being trapped in a gridlock rush hour.