A carcinogen is any substance capable of causing cancer due to its ability to interfere with biological processes by damaging the DNA or by altering the cellular metabolism. Ionizing radiations emitted by radon gas, radioactive fallout, x-rays and explosions of nuclear weapons are considered carcinogens. Common examples of non-radioactive carcinogens are solvents like benzene, inhaled asbestos, certain dioxins, metals like arsenic, lead, tobacco smoke, etc.

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