Known and Probable Human Carcinogens
American Cancer Society | Public / Patient
Carcinogen classifications
ACS guide to how carcinogens are classified, with examples including tobacco smoke, alcohol, ultraviolet radiation, benzene, some occupational exposures, and other environmental agents.
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National Cancer Institute | Public / Patient
Cancer risk factors
NCI overview of established and studied cancer risk factors, including alcohol, tobacco, radiation, sunlight, infectious agents, obesity, diet, hormones, and environmental substances.
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