aA patient with bone cancer has recently undergone chemotherapy and radiation therapy to reduce the size of the tumor. The patient is taking a large dose of an opioid analgesic, along with acetaminophen and an antidepressant. The nursing student caring for this patient is concerned that the patient is showing drug-seeking behaviors, because the individual requested an increased dose of the opioid. The student discusses this concern with the nurse. Which statement by the student indicates a need for further teaching