1. Eriksen M , Mackay J , Schluger N , et al . The Tobacco Atlas. 2018 http://www.tobaccoatlas.org/topic/smokings-death-toll/ (accessed 3 Jan 2018).
2. World Health Organization. Tobacco. 2018 http://www.who.int/mediacentre/factsheets/fs339/en/ (accessed 3 Jan 2018).
3. Atlanta CDC. Smoking and tobacco use. Fast facts. https://www.cdc.gov/tobacco/data_statistics/fact_sheets/fast_facts/index.htm (accessed 3 Jan 2018).
4. Asma S , Mackay J , Song SY , et al . The GATS Atlas. 2015. CDC Foundation, Atlanta, GA. http://www.gatsatlas.org/ (accessed 2 Jan 2018).
5. Ministry of Health and Family Welfare, Government of India, New Delhi. Global Adult Tobacco Survey: GATS India 2009-2010, 2010.