Youth drinking has many immediate and long-term adverse consequences including injuries, risky sexual activity, and increased risk of later alcohol abuse and dependence. This national longitudinal study examined the effects of exposure to alcohol advertising on consumption of alcohol by youth over time. The study combined a household telephone survey with data on alcohol advertising expenditures and exposure to advertisements. Youth who saw more alcohol advertisements drank more on average—every additional advertisement seen increased the number of drinks consumed by 1%. Each additional dollar spent per capita on alcohol advertising was associated with a 3% increase in the number of drinks consumed. The study clearly indicates that alcohol advertising is related to the amount of youth drinking and suggests that limiting advertisements would have a beneficial effect on drinking problems among youth.