Actually, that is not true. 1 in 6 teens who use marijuana will become addicted, and the number rises to 1 in 4 if a teen tries it in the 8th grade or younger. As a matter of fact, marijuana dependence is the number one reason for Nevada teens age 12 to 17 to enter into substance abuse treatment AND more Nevada teens are in treatment for marijuana dependence than for all other illicit drugs combined.
Anthony, J.C., Warner, L.A., & Kessler, R.C. (1994); Giedd. J. N., 2004
Center for Behavioral Health Statistics and Quality, Substance Abuse and Mental Health Services Administration, Treatment Episode Data Set (TEDS)
Based on administrative data reported by States to TEDS through Oct 24, 2014