Final answer:
Luther Terry confirmed that cigarettes are a cause of cancer, with tobacco smoke containing numerous carcinogens like nicotine and formaldehyde, leading to an increased risk of several types of cancer.
Step-by-step explanation:
Luther Terry, who served as the U.S. Surgeon General, affirmed that cigarettes cause cancer. When considering the composition of tobacco smoke, it's apparent that it increases the risk of cancer due to the presence of dozens of cancer-causing chemicals known as carcinogens.
These substances, such as nicotine, formaldehyde, benzopyrene, acrolein, and nitrosamines, have been shown to cause cancer. Tobacco smoke is a major source of these chemical carcinogens, and smoking cigarettes is correlated with a higher risk of various cancers, including cancer of the lung, larynx, head, neck, stomach, bladder, kidney, esophagus, and pancreas.