These studies are usually bullshit. They never factor in epigenetics and they never provide explanation for how these genes are associated. For example, if there's some gene or group of genes associated with risk taking behavior and they call it a "drug addict gene" even though it's also present in sky divers, business entrepreneurs, gambling addicts, etc. And only in specific groupings, and these groupings aren't immutable since childhood. They do the same thing with homosexuality. It's just darwanist nihilist nonsense.