Degenhardt, Louisa; Dierker, Lisa; Chiu, Wai Tat; Medina Mora, Maria Elena; Neumark, Yehuda; Sampson, Nancy A.; Alonso Caballero, Jordi; Angermeyer, Matthias C.; Anthony, James C.; Bruffaerts, Ronny; Girolamo, Giovanni de; de Graaf, Ron; Gureje, Oye; Karam, Aimee N.; Kostyuchenko, Stanislav; Lee, Sing; Lépine, Jean-Pierre; Levinson, Daphna; Nakamura, Yosikazu; Posada Villa, José; Stein, Dan J.; Wells, J. Elisabeth; Kessler, Ronald C.
(Elsevier, 2010)
BACKGROUND: It is unclear whether the normative sequence of drug use initiation, beginning with tobacco and alcohol, progressing to cannabis and then other illicit drugs, is due to causal effects of specific earlier drug ...