Nicotine is a pharmacologically active and addictive compound found in tobacco. Research on nicotine often focuses on its effects on the brain, behavior, and health. This includes studying its impact on cognitive function, mood regulation, and cravings, as well as its role in the development and maintenance of nicotine dependence. Additionally, research on nicotine examines its potential health effects, such as its contribution to cardiovascular disease, respiratory issues, and cancer. Overall, studies on nicotine aim to understand its mechanisms of action and develop interventions to help individuals quit smoking and reduce the harmful effects of nicotine exposure.