I knew I had read this some where:
gamma-Aminobutyric acid - Wikipedia, the free encyclopedia
Alcohol affects this GABA receptor in the brain.
"alcohol affects the gamma-aminobutyric acid (GABA) receptors, to produce a depressant (neurochemical inhibitory) effect. Alcohol is similar to other sedative-hypnotics such as barbiturates and benzodiazepines both in its effect on the GABAA receptor although its pharmacological profile is not identical. It has anxiolytic, anticonvulsant, hypnotic and sedative actions similar to many other sedative-hypnotic drugs. Alcohol is also cross-tolerant with benzodiazepines and barbiturates.[51]"
This is not the exact article I read which went on to say the GABA receptors inhibit the seratonin levels. When the alcohol is taken away, the body just goes berzerk. Therefor, to me, it's not a disease. It's a dependency, like the others have said.
As for varying degrees, for me it' was 100%. Couldn't function without several drinks every day. Not any more. Day 6 and counting!
EDIT: here's a little better description:
http://www.neurogenesis.com/Neurosci...addictions.php (yes, been doing homework on my "resting" days off)
EDIT2: possible cure?
http://alcoholism.about.com/cs/effect/a/blscr040304.htm