According to the Diathesis-Stress Model:

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According to the Diathesis-Stress Model, genetic vulnerability lowers the threshold for stress to create alcoholism. This means that individuals who have a genetic predisposition to alcoholism may be more likely to develop the disorder when they experience stressful events or situations. It does not mean that everyone who inherits the gene will become an alcoholic, nor does it mean that alcoholism is solely determined by genetics. Environmental factors and personal choices also play a role.