Final answer:
The number one cancer caused by tobacco use is Lung cancer. Smoking causes 90 percent of lung cancers, as well as increasing the risk of other cancers such as larynx, head, neck, stomach, bladder, kidney, esophagus, and pancreas.
Step-by-step explanation:
The number one cancer caused by tobacco use is Lung cancer. Tobacco smoke contains numerous cancer-causing chemicals, and smoking causes 90 percent of lung cancers. In addition to lung cancer, smoking also increases the risk of other types of cancer such as larynx, head, neck, stomach, bladder, kidney, esophagus, and pancreas.