Several issues to come to mind concerning “smart pills”.  First, it is patently unfair.  It provides an unnatural advantage to the user.  Study and ability should be approached by efforts afforded to each individual such as study, and application of material learned.  Not by an artificial enhancement not available to all. 
Next, we are human beings.  It is abhorrent to think that businesses, schools, other, should benefit by artifically placing unrealistic expectations on humans.  The risk is placed on the individual using the artifice, yet no risk is incurred by the business, school, or other by inferring upon individuals the requirement to take the smart pills to work harder, get the job, etc.  It is outrageous that the drug usage has not been stopped.  I add, too many people purport to be attention deficit when in reality parents get their kids routinely diagnosed so that they will have extra time for their exams, or qualify to get into more prestigious universities, albeit with this type “disability”.  It is my understanding that some Law Bar exams allow considerably more time to take the BAR if the student is identified as ADD.  Yet, the ADD tag does not accompany them once the BAR exam has been passed.  This is a very real disadvantage to regular students whose performance requires serious time constraints.  Is it fair?  No.  Is it just?  I don’t know.