Ahmad Iqbal, M. M.; Ahsan Iqbal, M. M.; Ashraf, M. F.; Mehmood, Z.; Ali, U. Transition from Smoking Drugs to Injectable Drugs: Causes and Consequences. Pak. J. Nutr. 2015, 14 (8), 535–539. https://doi.org/10.3923/pjn.2015.535.539.