There is no simple correlation.

Talking about these issues,
you need to define 聪明 and 幸福 first.

If you mean
high IQ and EQ as 聪明,
and
nothing lacking in life and being able to do what you like as 幸福

then

at least
FZZ is not only 聪明 but also 幸福

he figured out 'there is no God' according to his 聪明 and he live a 幸福 life based on 'there is no God'