 Arsenic is a natural element that can be found in many different forms and sources. It is commonly found in soil, water, food, air, and even cigarettes and other products. Exposure to arsenic through these sources can lead to adverse health effects such as cancer. Drinking water is the most common root of exposure, but food and air can also be sources of arsenic poisoning. Industrial activity and smoking can increase the amount of arsenic inhaled or ingested. In addition, the World Health Organization has recently reported that cosmetics containing heavy metals, such as arsenic, can be dangerous if not properly regulated. Furthermore, developing countries often have more industrial factories, leading to increased air pollution and higher levels of arsenic exposure. This article was authored by Jin Yong Chung, Sun Bi Yu, and Young Sub Hong.