SAMHSA: Treatment Episode Data Set 1996

Primary marijuana abuse accounted for 13 percent of TEDS admissions in 1996 (Table 3.2).
Marijuana admissions were generally male, white, and young (Table 3.1). Three-quarters were male, 60 percent were white, and 45 percent were under 20 years old. Marijuana was the most common primary substance problem among admissions under 20 (Table 3.2).

Figure 14. Marijuana/Hashish
Admissions by Sex, Age, and Race/Ethnicity: 1996

Marijuana use began at an early age among primary marijuana admissions--about half had first used marijuana by the age of 14, and three-quarters by the age of 16 (Table 3.5).
Half of marijuana treatment admissions were referred through the criminal justice system (Table 3.7).
Secondary use of alcohol was reported by 59 percent of admissions for primary marijuana abuse (Table 3.8).