Being smart has nothing to do with success. Success is based more on drive, a high emotional intelligence quotient, positive attitude, enthusiasm, and excellent social skills.
...i agree completely.
being smart doesn't guarantee that you'll be able to avoid a major pitfall later in life.
even the most "elite" intellectuals can fall into a rut of depression, get stuck, feel defeated, lose everything, and end up living in a box on the street.
everyone encounters obstacles in life... and being successful in school doesn't mean that you'll know how to handle the 'challenges' that you may have to face later on.
(plus, like someone else said, it all depends on how you define "smart"...)