1Scientists have identified several carcinogens in tobacco smoke that increase the risk of lung cancer.
2The company was fined for releasing carcinogens into the air and water near the factory.
3Some foods contain natural carcinogens, but cooking and processing can reduce their levels.
4The government has banned the use of certain carcinogens in pesticides and cosmetics.
5Researchers are studying the effects of carcinogens on human cells and developing new treatments for cancer.