Association of Pre-Onset Cannabis, Alcohol, and Tobacco Use With Age at Onset of Prodrome and Age at Onset of Psychosis in First-Episode Patients

M. T Compton, M. E Kelley, C. E Ramsay, M Pringle, S. M Goulding, M. L Esterberg, T Stewart and E. F. Walker

American Journal of Psychiatry 166 ( 11 ): 1251 - 1257 , 2009