1 Mental health, Alcohol, Substance use & Tobacco Research Unit, South African Medical Research Council, Pretoria, South Africa [email protected].
2 Department of Public Health, Sefako Makgatho Health Sciences University, Pretoria, South Africa.
3 Mental health, Alcohol, Substance use & Tobacco Research Unit, South African Medical Research Council, Pretoria, South Africa.
4 Department of Psychology, University of the Witwatersrand, Johannesburg, South Africa.
5 Community Oriented Primary Care Research Unit, Department of Family Medicine, University of Pretoria, Pretoria, South Africa.
6 Africa Centre for Tobacco Industry Monitoring and Policy Research, School of Health Systems and Public Health, University of Pretoria, Pretoria, South Africa.