1. 1. Chandrupatla SG, Tavares M, Natto ZS. Tobacco use and effects of professional advice on smoking cessation among youth in India. Asian Pac J Cancer Prev 2017;18:1861–7.
2. 2. Apollonio D, Philipps R, Bero L. Interventions for tobacco use cessation in people in treatment for or recovery from substance use disorders. Cochrane Database Syst Rev 2016 Nov 23;11:CD010274.
3. 3. American Cancer Society. Benefits of quitting smoking over time. Available at URL: https://www.cancer.org/healthy/stay-away-from-tobacco/benefits-of-quitting-smoking-overtime.html. Accessed on August 25, 2018.
4. 4. Centers for Disease Control and Prevention. Cigarette smoking among adults—United States, 2000. Morb Mortal Weekly Rep 2002;51:642–5.
5. 5. Anderson CM, Zhu S. Tobacco quitlines: looking back and looking ahead. Tob Control 2007;16:i81–i86.