Cancer is defined as abnormal and out of control growth of cells in any organ or part of the body. There are various reasons that lead to the development of a cancerous growth in the body. Genetic predisposition and environmental factors together play an important role in developing a cancer. Genetic constitution of the body is something that cannot be controlled, but controlling the external environmental factors is in one’s hands. Environmental factors contribute to more than 90% of all cancers. Active or passive smoking is one of the biggest causes resulting in developing various types of cancers in the body.