It appears that Jeb Bush was a major stoner during his high school years:

In the fall of 1967, when a 14-year-old Texan named John Ellis Bush arrived on the bucolic campus of Phillips Academy in Andover, great expectations preceded him.

Jeb, as he was known, should have been an easy fit in that elite and ivied world. His much-accomplished father and his older brother had both gone to Andover; no one was surprised that Jeb had followed suit.

But this Bush almost ran aground in those first, formative prep school days. He bore little resemblance to his father, a star on many fronts at Andover, and might have been an even worse student than brother George. Classmates said he smoked a notable amount of pot — as many did — and sometimes bullied smaller students.

Resolutely apolitical despite his lineage, he refused to join the Progressive Andover Republicans club and often declined even to participate in informal bull sessions with classmates. In a tumultuous season in American life, he seemed to his peers strangely detached and indifferent.

(emphasis mine)

So Dubyah is the smart one?

That is a scary thought.