Two psychological theories have been proposed as being related to the relationships among depression, alcoholism, and smoking behavior. First, drug use (including that of nicotine and alcohol) might be motivated by a person’ s expectation of the outcome, such as a decrease in negative affect and tension. If such a person is also depressed, there might be an even greater motivation to alleviate dysphoria or anxious mood. Second, depressed smokers with or without alcohol dependence might have less self-efficacy and, therefore, more difficulty becoming abstinent than their nondepressed counterparts.