Patel, D. K. “A Study on Effects of Severity of Cigarette Smoking On Lung Functions of Adult Population in North Gujarat Region: A Study on Effects of Severity of Cigarette Smoking On Lung Functions”. National Journal of Integrated Research in Medicine, vol. 5, no. 6, Jan. 2018, pp. 39-43, http://nicpd.ac.in/ojs-/index.php/njirm/article/view/826.