In a study that excluded cannabis users, researchers found that alcohol hangovers significantly impair both executive function (paying attention, regulating emotions, etc.) and prospective memory (remembering future plans).
DSM-5 cannabis withdrawal syndrome: Demographic and clinical correlates in U.S. adults
Cannabis withdrawal syndrome affects approximately 12.1% of heavy cannabis users and is characterized by symptoms such as nervousness/anxiety, hostility, sleep difficulty, and depressed mood. It has increased prevalence among those suffering from mood disorders, anxiety disorders, and personality disorders. This new data should emphasize the need for physicians to exercise caution when recommending cannabis to individuals who may end up consuming cannabis heavily, and who also suffering from mood, anxiety, or personality disorders