Children who are bullied in fifth grade are more likely to become depressed and experiment with drugs and alcohol during their teen years than their peers who weren’t victimized by other kids, a U.S. study suggests. Researchers followed almost 4,300 students starting in fifth grade, when they were around 11 years old. By tenth grade, 24 percent of the teens drank alcohol, 15 percent smoked marijuana and 12 percent used tobacco. More frequent episodes of physical and emotional bullying in fifth grade were associated with higher odds of depression by seventh grade, which was in turn linked to greater likelihood of substance use later in adolescence, the study found. "We drew on the self-medication hypothesis when trying to understand why peer victimization may lead to substance use over time," said lead study author Valerie Earnshaw, a human development and family studies researcher at the University of Delaware in Newark. "This suggests...