Dаvid is а 43-yeаr-оld male whо has a diagnоsis of schizophrenia who has been stable on risperidone for several years. He has been smoking cigarettes for 20 years, about 1 pack/per/day. He is now ready to quit. After review of medical history and labs, it is decided that varenicline will be started. What is the priority teaching that needs to be provided to the patient?