Note: Illicit drug use by those age 12+ in the past month. Illicit drugs include marijuana/hashish, cocaine (including crack), heroin, hallucinogens, inhalants, or prescription-type psychotherapeutics used nonmedically. Based on the results from the 2007 National Survey on Drug Use and Health where the estimates come from a survey-weighted hierarchal Bayes estimation approach in which the 95 percent prediction (credible) intervals are generated by Markov Chain Monte Carlo techniques.