2.
A 21-year-old male college student has been drinking more alcohol over the past 12 months. He has intended to cut down several times, but each weekend winds up drinking more than he had intended. He spends a great deal of time obtaining beer and recovering from hangovers, and as a result, has stopped playing basketball and has spent less time with his girlfriend. He has not developed tolerance or withdrawal. He also drinks four cups of coffee per day. His most likely diagnosis is: