1. Level of Use of Marijuana among Youth Aged 12-19 Years in Botswana • Widzani Judith Amos, university of Botswana; Enock Ngome, University of Botswana.

2. Substance Use Cascade among Youth in Six Southern Africa Countries: Prevalence and Risk Factors • Ololade Julius Baruwa, University of Cape Town; Christine Chawhanda, Wits University; Jonathan Levin, University of the Witwatersrand; Latifat Ibisomi, Wits University.

3. The Effect of Family and Neighbourhood Social Capital on Youth Mental Health in South Africa • Oluwaseyi Somefun, University of the Witwatersrand, Johannesburg; Arlette Simo Fotso, French Institute for Demographic Studies (INED).