D. . Imtiaz, S. D. . Kandpal, R. . Juyal, V. P. . Shrotriya, and A. K. . Singh, “A Study on Prevalence and Pattern of Smoking Among Rural Population in Dehradun District of Uttarakhand”, Natl J Community Med, vol. 5, no. 04, pp. 440–443, Dec. 2014.