The Centers for Disease Control and Prevention has just released the results of the 2011 national Youth Risk Behavior Survey, which found that one in three teens text while driving. During the 30 days before the survey, about 33 percent of high school students nationwide had texted or emailed while driving, almost 39 percent had consumed alcohol, and 23 percent had used marijuana. The 2011 survey was the first time students were asked about texting while driving. But the news wasn't all bad, as the survey also found that from 1991 to 2011, the proportion of high school students who never or rarely wore a seat belt decreased from 26 percent to 8 percent. The survey involved more than 15,000 teenagers in 43 states and 21 large urban school districts. See the teen texting survey from the CDC here.