Cancer kills more than half a million people a year in the U.S., making cancer the second leading cause of death in the country, exceeded only by heart disease, according to the Centers for Disease Control and Prevention(CDC). What increases the risk of cancer is a complicated questions with many answers. When it comes to prevention, most people concentrate on lowering alcohol consumption, quitting cigarette smoking and protecting yourself from the sun. But people should also consider other possibilities, such as toxins in your home.