http://bentasker.i2p/posts/blog/health/spending-a-week-without-gummies.html
Judging Pain By Stopping It seems worth discussing one of the problems with judging the efficacy of pain relief by withdrawing it. Certain drugs are known to cause pain. Codeine (and other opiates), for example, can cause headaches. The user will then treat that pain with more codeine, potentially leading to a self-fuelling addiction but certainly generating more frequent headaches.