Not all drug users NEED rehab.
Ah yes, another "benefit" of how Americans are propagandized about drugs: the popular image of all addicts as disfunctional.
Dubya, like most people who overdo it, realized he was headed for trouble and quit drinking and, I think one can assume, all other intoxicating substances.
But if that were widely known, it might put a kink in the plans of the quacks that run marijuana "rehab" clinics.