^ Have you known someone addicted to Heroin?
You cannot compare the two. Trust me, I know.
Alcohol is addictive, but, nothing like a narcotic or drug, but, still, addictive nonetheless.
Anyone can be addicted to anything. I don't have an addictive personality so I don't get it at all but I know plenty of people that can't function daily without eating, drinking, or doing X. Whether it be drugs, alcohol, coffee, or even going to the gym to get a workout. Addicts are everywhere.