Scientists and ethicists have attempted to answer these questions while analyzing the overall effect on society. For example, it is largely accepted that mind-enhancing drugs are acceptable for use on patients diagnosed with cognitive disorders, as in a case of prescribing Adderall to children and adults with ADHD. However, Adderall and Ritalin have also become popular black-market drugs, most notably on college campuses. Students often use them to maintain focus when struggling to complete large amounts of schoolwork, and often become dependent on the effects produced.