If you agree to participate, you will undergo screening to confirm that this study is right for you. Once screening is complete, you will complete questionnaires, blood, and saliva tests, memory and thinking skills tests, and brain Magnetic Resonance Image (MRI). Participants will then complete CREMA sessions (Cue Reactivity Ecologic Momentary Assessment) at home, three times a day for a week. CREMA sessions include looking at stressful and neutral pictures and rating stress and craving. During this week, female participants (only) will also collect and store additional saliva samples each morning for hormone testing. At the end of this week, you will return to the clinic and participate in a stress task. The total time you will be in this study is about two weeks.