Final answer:
A mutagen is a substance that causes DNA mutations, but not all mutagens cause cancer. Carcinogens are mutagens that specifically cause cancer.
Step-by-step explanation:
A mutagen is a substance that causes DNA mutations. It is important to note that not all mutagens cause cancer, but mutagens that do cause cancer are known as carcinogens. Examples of carcinogens include tobacco smoke, which is associated with lung and bladder cancers, and prolonged exposure to asbestos fibers, which is associated with mesothelioma.