Figure 2.1 is titled "Types of Drugs Used by Past Month Illicit Drug Users Aged 12 or Older: 2003." It is a pie chart, with the following note below the chart: "19.5 Million Illicit Drug Users." The pie chart shows the percentages of types of drugs used by past month illicit drug users. Of the 19.5 million past month illicit drug users, 54.6% used marijuana only, 20.6% used marijuana and some other drug, and 24.8% only used a drug other than marijuana.