Source

Zale EL, Dorfman ML, Hooten WM, Warner DO, Zvolensky MJ, Ditre JW. Tobacco Smoking, Nicotine Dependence, and Patterns of Prescription Opioid Misuse: Results From a Nationally Representative Sample. Nicotine Tob Res. 2014;17(9):1096-103.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4542735/