When I work on our chemical dependency unit, all of the patients there are alcoholics or drug abusers for a reasons and use, as a means of self medicating. Be it abuse (of all kinds) depression/ low feelings of self worth. Husband, girlfriend, wife left them. Or what I see a lot these days, people out of work and just depressed and turn to the bottle or heroin (et al.) just to cope. People just don't turn to abusing alcohol/drugs for no real rhyme or reason.
Yup.
Alcohol is a drug. It has a chemical influence on the brain. Some people use it as a crutch to try to self-medicate their "bad" feelings away. It doesn't work. Especially in depression, alcohol is a depressant, when a chemical depressant is introduced to a depressed brain, the only thing that can logically happen is deeper depression. However, depressed people can't/don't see this and just keep drinking more, in the hopes that the numb will make the sad go away.