As New Year's Eve revelers across the world clinked glasses and ordered rounds, Surgeon General Vivek Murthy was in the midst of delivering a grave message about alcohol, a drug that fits neatly into both our highest highs and lowest lows.

The top U.S. health official is calling for all alcoholic beverages to carry a warning label about cancer risk.

Dr. Vivek Murthy issued an advisory Friday about alcohol and cancer risk and called for changes to beverage warning labels.