What indicates a therapeutic response for a client taking varenicline?

The statement "I am not smoking cigarettes anymore." reflects a therapeutic response for a client taking varenicline, which is a prescription medication used to help people quit smoking. Varenicline works by targeting nicotine receptors in the brain, reducing withdrawal symptoms and cravings associated with quitting smoking.

A client reporting that they have successfully ceased smoking indicates that the medication is effectively aiding in their quit attempt. This cessation is a primary goal of varenicline therapy, showcasing that the medication is providing the expected outcome.

While other statements regarding improvements in depression, sleep patterns, or focus may be important aspects of a client's overall health, they do not directly relate to the specific therapeutic objective of varenicline, which is focused on smoking cessation. Therefore, the correct answer aligns directly with the main purpose of the treatment, emphasizing the successful outcome expected from taking varenicline.