How exactly is alcoholism (and drug abuse for that matter) considered a disease?

Can you answer shipit67’s question about Addiction?:

My dad is a piece of crap alcoholic. The alcoholics anonymous “Big Book” compares alcoholism to an allergy and an illness. Am I the only one who is saying “huh?!” You have to DRINK in order to become an alcoholic, whereas contracting most forms of illness, (with the exception of STD’s, lung cancer induced from smoking, etc.) are contracted through no fault of the person stricken with the illness. My dad didn’t have to start drinking, he chose to.

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