Studies in the UK have concluded that pilots are some of the most susceptible to cancer due to many factors associated with their jobs. Skin cancer is attributed to their long hours sitting besides windows in short sleeved clothing exposing them to more cosmic radiation and the sun’s UV rays than those who are at ground level. The effects of the interruption of the biological clock are also attributed as a major cause of frequent fliers such as pilots, air crews and business travelers. The interruption to the daily cycle of the human body has effects that are still under study but it may have bearing on a lowering of the immune system and other vital human systems. Leukemia is also common among pilots along with skin cancer and many other forms of internal organ problems.