Adderall has now become ubiquitous on college campuses, widely taken by students both with and without a prescription. Black markets have sprung up at many, if not most, schools. In fact, according to a review published in 2012 in the journal Brain and Behavior, the off-label use of prescription stimulants had come to represent the second-most-common form of illicit drug use in college by 2004. Only marijuana was more popular.
We know very little about what Adderall does over years of use, in and out of college, throughout all the experiences that constitute early adulthood. To date, there is almost no research on the long-term effects on humans of using Adderall.