Cytisine is a natural alkaloid used for smoking cessation. However, it is crucial to ensure the purity of the compound to avoid any potential health hazards. The presence of impurities in cytisine may affect its efficacy and safety. Some common impurities in cytisine include nicotine, anabasine, and other alkaloids, which can have adverse effects on the body. Therefore, it is important to use high-quality, pure cytisine to ensure its effectiveness and safety.