But think of how many dealers will stop selling, they can now get legal jobs being delivery boys, some of the more successful ones could open up their own smoke bars, or shops, not to mention the growers who would now have cushy government jobs. The availability of illegally obtained marijuana would be at an all time low, and the quality of the illegal would significantly drop, much like cigarettes & liquor, because they are forced to use cheaper product to undersell the government.
Honestly I would much rather be paying taxes, just like I do for my liquor. Quality control, chemical restrictions(pesticides etc.), and consistency are all aspects I would be quite happy with paying a little bit more.