Many, many people have been made seriously ill due to their exposure to hazardous or toxic substances. Some people receive occupational exposures, such as when their job requires them to work with a substance that can make them ill. Other people are exposed to dangerous substances environmentally, through the air or water. When there is sufficiently serious exposure over a long enough period of time, it can cause serious illnesses such as cancer or damage to organs. Substances which are known to be toxic or carcinogens include:
