If you are found to be eligible, you will be enrolled in this study and asked to complete an interview that should last about 1 hour. During this interview, you will be asked basic questions, such as your age, education level, and smoking history. You will also be asked questions about your mood, quality of life, and stress. You will then be asked to complete a short test that involves completing some basic tasks, such as remembering several words and drawing a simple shape. This test, which will take about 2-5 minutes to complete, is used to measure attention and concentration.