NICOTINE LOZENGE: Nicotine Lozenge 4mg is part of a Nicotine Replacement Therapy, a treatment to help people stop smoking. Compare to the active ingredient in Nicorette SMOKING CESSATION: Nicotine Replacement Theory is designed to wean your body off cigarettes. It helps regulate, control and gradually reduce your body's cravings for nicotine. QUITTING SMOKING: Smoking has two addictive components, a physical and a mental need for the nicotine in tobacco.