BACKGROUND Previous theory and research suggest links between substance use and externalizing behavior problems, but links between substance use and internalizing problems are less clear. The present study sought to understand concurrent links among diagnoses of substance use disorders, internalizing disorders, and behavior disorders at age 18 as well as developmental trajectories of illicit su...

introduction & objective: substance abuse is believed to be one of the greatest social, economical ,and cultural problems all over the world and it is commonly observed among all social classes especially among mental disorder patients. substance abuse can influence on the receptive-mental states such as mood and on the external visible activities such as behaviors. the aim of this study is to ...