Base- A drug or other substance affecting mood or behavior and sold for non-medical purposes, especially an illegal one. Some examples are Cocaine, Marijuana, Meth, and Crack. But remember kids never take drugs and stay in school.
Suffix- This suffix means the study of. So some examples of this suffix include Biology, Archaeology, and Criminology.
Noun- This noun means the study of drug and alcohol abuse and associated treatments. This is different from the base because the base just means drugs and or other substances. But this new noun is the study of the drugs and alcohol and not the drug.