My opinion...
After marijuana is legalized it will ultimately become a dangerous drug. Companies like Monsanto will begin patenting the seeds, and spraying the plants with poisons. Then, cigarette companies like Philip Morris will mix the product with chemicals like they did with tobacco, and before you know it, pot will become a killer drug. This is why I am not really all-in on this new "legalize-it" movement. Decriminalize it - YES, but to fully legalize it will be a nightmare.
What say you?