Students who smoke cigarettes or drink alcohol are more likely to have bad grades, according to results of the 2011 Connecticut Youth Risk Behavior Survey. The survey shows that only 8.4 percent of students who acknowledged smoking cigarettes in the past 30 days routinely received As in school. On the other hand, 39 percent of those students received Ds or Fs. A similar survey by the Centers for Disease Control and Prevention (CDC) indicated that even minimal smoking correlates with lower grades. The CDC’s National Youth Risk Behavior Survey of 2009 showed that 31 percent of high school students who had ever tried cigarette smoking – even one or two puffs – received mostly A’s.