How do drugs and alcohol function in Long Day's Journey Into Night?

Mary's morphine addiction is balanced by the men's alcoholism. Although the morphine is perhaps a more destructive drug, alcohol does its fair share of damage to the Tyrone men. It is Tyrone's great vice, and it has contributed to Mary's unhappiness. Drunkenness has been Jamie's response to life, and it is part of why he has failed so miserably. And Edmund's alcohol use has probably contributed to ruining his health.