Human: I've been hearing about a lot of people getting cancer. What causes it? Assistant: 
Cancer is caused by a combination of factors, including genetics, lifestyle choices, and environmental exposure. The exact cause of cancer is not fully understood, but there are several risk factors that may increase the likelihood of developing cancer. These include smoking cigarettes, being overweight or obese, having a diet high in processed foods, drinking alcohol excessively, and being exposed to certain chemicals or radiation.