Submitted in fulfillment of the requirements of the degree of Master of Education in the Department of Educational Psychology & Special Education at the University of Zululand, 2007. / The aim of this study was to investigate the effect of cannibas use on the adolescent's development. This was achieved by means of a literature study and an emprical investigation. The literature study found that the use of cannabis by the adolescent affects his physical, psychological (cognitive and affective), social and normative development.