Many products can help you quit smoking. Some are prescription medicines that help curb your cravings and withdrawal symptoms. Other products slowly lessen the level of nicotine your body absorbs. Nicotine is the highly addictive substance found in cigarettes, cigars, and chewing tobacco. Nicotine replacement products can help get your body used to slowly decreasing amounts of nicotine after you quit smoking. These products include a nicotine patch, gum, lozenge, nasal spray, and inhaler. Always follow the directions for your medicine or product carefully. Your healthcare provider may tell you to start taking the prescription medicine 1 week before you plan to quit. Don't smoke while you use nicotine products. Doing so can harm your health.