It can be used to toast to someone's good fortune or hope for a better future. It can be used in an expression of undying love or simply to enjoy a relaxing moment at the end of a difficult work week.
But alcohol can be an evil thing, also. Alcohol can cause brain damage, heart problems, and strokes. Alcohol can lead to liver damage. Alcohol can lead to drunken driving accidents and even death.
These people are called alcoholics, and this book was written for them. The alcoholic has a disease called alcoholism, and like anyone else with a disease, they need help.