Whether sipping beer, wine or whiskey, women who drink just three alcoholic beverages a week face slightly higher chances for developing breast cancer compared with teetotalers.The link between alcohol and breast cancer isn't new, but most previous studies found no increased risk for breast cancer among light drinkers. The new research provides compelling evidence because it followed so many women for up to almost 30 years, experts said.Still, the study only shows an association between alcohol and breast cancer; it doesn't prove that drinking causes the disease. There could be some other reason light drinkers appeared to be at higher risk maybe they were less active than nondrinkers or had unhealthy diets.Drinking alcohol "is definitely not one of the leading explanations" for why breast cancer develops, . "It's one of many contributing factors."s active than nondrinkers or had unhealthy diets.