In an effort to capture market shares, significant R&D will be devoted to creating superstrains of marijuana. The metrics for success will be the intensity of the experience.
1 in 10 people with drivers licenses can be diagnosed as schizophrenic by certain state standards.
With super-pot legal and available to everyone, including the mentally ill, there will be bloody murders. As soon as a mentally ill black kid smears his homeroom with a couple of Uzi's and they find superpot in his system, the middle class will collectively shit itself. There will be 'enhanced sentencing guidelines' like the crack v powder ones in the 80s, you can also expect a calculated erosion of personal privacy rights.
But whats really going to be interesting is when the right wing captures a huge swathe of the center by portraying this initiative as a liberal nightmare unleashed on God fearing Americans who can no longer protect their children.
This could easily turn into Obama's WMD/Iraq.