An annual survey of high school students, called the Monitoring the Future project, provides information on substance use by adolescents who remain in and graduate from high school. In contrast, much less is known about the substance use of those who drop out of high school. Nonetheless, evidence from a variety of sources suggests that high school dropouts are much more likely to have started using tobacco, alcohol, and other drugs when compared to their peers who remained in school. One recent study of 1,300 high school students found that students who have smoked marijuana at least once are more than twice as likely to quit school than those who have never smoked marijuana. Evidence also shows that dropping out of high school can increase a person's risk of problems with alcoholism as an adult. Whether this also applies to other drugs, such...