Upon completion of this module, learners will be able to: Become familiar with the last three classes of abusable drugs: the inhalants, caffeine and others; review the 10 classes of abused and addicting drugs, their effects, and toxicities; recognize the importance of using animals in research on addicting drugs; compare two important animal models, self-administration and conditioned place preference (CPP); and recognize how both animal drug self-administration and conditioned place preference (CPP) are used to understand how drugs work in the brain and how they are used to screen for and develop new treatments and medications.