Risk factors, such as tobacco or alcohol use by pregnant women, have not been shown to clearly correlate with ADHD in offspring, with results varying among studies. Links between prenatal exposures and later outcomes can be evaluated through large cohort studies, using extensive clinical and socioeconomic data to control for potential confounders. In one such analysis, the Danish National Birth Cohort study,[1] mothers were recruited between 1996 and 2002, and data on coffee and tea consumption were obtained by maternal self-report.