Oh it can be overcome but it has been studied. You can see the result of what I’m talking about in the reservations. Alcoholism, liver failure, gambling, nicotine addiction, and kidney function failure.
However when you remove the person from the environment and learned influence, you will find behavior markers which are assumed to be genetic are remarkably reduced. Yes you’ll find the genetic predisposition to pursue life long and changing addictive activities but without the reinforcement of learned behavior, it’s harder to form the addiction.
It didn’t mean they won’t. The addictive personality is always lying in wait— like a sleeping giant.