Genetics and lung diseases in one’s genetics can also become significant risk factors of lung cancer. For example, if a person’s mother, father, sibling, aunt, uncle, or grandparent has had lung cancer, the chances of this person developing lung cancer slightly increases. At the same time, it has not been yet researched whether genes indeed increase cancer chances, or they simply increase individuals’ susceptibility to this disease. As for lung diseases, some of them are known to affect the chances of cancer development. In particular, among such diseases are tuberculosis and chronic obstructive pulmonary disease. Other illnesses like chronic bronchitis and emphysema can cause scarring in the lungs, which means the increase of the amount of tissue in them – and as it is known, cancer is an uncontrolled division of cells, and the respective multiplication of tissues (Healthline).