Researchers have id’ed another gene that is implicated in more susceptibility to addictive behaviors.
"Previous evidence indicates that genes play a major role in liability to addictions, including alcoholism," said Riley. "Yet genes are certainly not sufficient to produce disease by themselves. The individual must be exposed to alcohol, which, in common with any chemical encountered in the world, is explicitly environmental. When you consider that addictions also involve that incredibly complex and unpredictable thing that is human behavior, then the real complexity of the problem is clear."
Also the real solution to the problem. If you can change the genes. Which they can now.