When does this behavior become inappropriate, causing the patient to be labeled a drug seeker? Clearly, there is no agreement on the definition of drug seeking.
One way to try to get a handle on what's happening in a scientific field is to study citations in research papers. n a visualization of a complex network with many links, however, it can be very difficult to recognize significant patterns amid the clutter
A. Ankolekar, M. Krötzsch, T. Tran, and D. Vrandecic. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 825--834. New York, NY, USA, ACM Press, (2007)