Research from the University of Buffalo, which tracked over 600 couples from the time they applied for marriage licenses through the first nine years of their marriage, highlights the detrimental effects of heavy drinking on marital stability. The study revealed that when one spouse was a heavy drinker while the other was not, the rate of divorce increased to 45%-55% within the first nine years. In contrast, couples where both partners were either heavy drinkers or neither engaged in heavy drinking experienced a lower divorce rate of 30%.