Both pain and addiction are tremendous public health problems. Practitioners of every stripe say that they learned precious little about pain or addiction in their training and readily admit that instruction on the interface of pain and addiction is nonexistent. The recent problem of prescription drug abuse has only served to highlight the fact that these two worlds need unificationthose who treat pain must be informed about the risks of controlled substances and those who treat addiction need to better and more fully understand their benefits. Nowhere is the pooled knowledge of pain...