An Oxford University study is among the first to link low-to-moderate alcohol consumption to breast cancer in women who drink as little as a single alcoholic beverage a day. “There were no minimum levels of alcohol consumption that could be considered to be without risk,” according to cancer epidemiologist and lead researcher Naomi Allen.

There is no absolutely safe level of consumption. “It is not necessary to drink huge amounts of alcohol—even low amounts taken regularly in a sensitive person increases their risk,” according to Helmut Seitz, professor of alcohol research at the University of Heidelberg in Germany. “The cells don’t forget. This will initiate tumors 20 to 25 years later,” he says.

Read more about health risks to social drinkers, and how new doctor endorsed Cheerz IntelliShots or iTabs can help.