A state quitline is a telephone-based service offered by individual states to help people quit smoking. These quitlines provide free counseling and support to individuals who are trying to quit smoking, as well as information on resources such as nicotine replacement therapy and other cessation aids. State quitlines are typically staffed by trained counselors who can offer personalized support and guidance to help individuals overcome their addiction to tobacco. Research in this area focuses on evaluating the effectiveness of state quitlines in helping people quit smoking and identifying ways to improve these services to better support individuals in their cessation efforts.