1. Organization WH . WHO global report on trends in prevalence of tobacco smoking 2000-2025 2018.
2. Use of cigarettes and other tobacco products among students aged 13-15 years--worldwide, 1999-2005;MMWR Morb Mortal Wkly Rep,2006
3. Smokeless tobacco use among adolescents in global perspective;Sinha;Nicotine Tob Res,2017
4. US Department of Commerce CB . National cancer Institute and centers for disease control and prevention Co-Sponsored tobacco use supplement to the current population survey 2007.
5. Hatsukami D , Zeller M , Gupta P , et al . Smokeless tobacco and public health: a global perspective 2014.