Each day we are exposed to risks. During the past 10 years, scientists have developed methods to assess risk, that is, to calcuate how much theoretical risk a given activity or condition poses. This information can help people make informed choices about controlling the risks they face. It is impossible to eliminate all risks from life, but people often can reduce their risks by limiting their exposure to the cause of the risk.
Exposure is a key factor in determining risk.
We know, for example, that smoking cigarettes increases the risk of respiratory ailments, including lung cancer. According to U.S. EPA, even second-hand smoke poses these dangers. But people can control these risks by not smoking and avoiding second-hand smoke. The role of exposure is important to remember regarding hazardous materials and environmental pollutants. Not all contaminants released to the environment result in an exposure for people.