It's pathetic to read about how people take drugs or want to take drugs because they have difficulties to focus on reading a book or focusing on a hobby or a boring job.
Sure there are people who really have issues and really have ADHD, but in those cases it's pretty obvious.
People want to take pills against obesity. People want to take pills to improve concentration. The easy path. Why not instead try regular exercise and >8h sleep per night? And no alcohol and drugs.