I'm not much of a drinker because I've been told that alcoholism runs in my family. I don't want to become alcohol dependent or abusive.
What then make people addicted to alcoholism?
The feelings people get from being under the influence make them want to drink more to keep that feeling more often. Over usage can result in social problems, health problems, and risky behaviors. 
What content does it have that makes on drunk?
It's the alcohol itself, C2H6O, that causes intoxication. 
So what help can you offer to addicts?
Programs like Alcoholics Anonymous, similar to Narcotics Anonymous, follow the traditional 12-step model.