A black market simply cannot compete with a well regulated market. Alcohol is such a market. Organized crime today can't make much money off of illegal alcohol sales. If they could, the cartels would be selling it.
The fact that it won't have a tax stamp makes it cheaper and even more desirable.
Pay attention now. I said if we regulated marijuana like we do alcohol, their revenues from mj would dry up. Imposing an excessive tax on marijuana would not be regulating it like alcohol... right?
It should be a self evident point that a well regulated market dries up a black market. Do you agree?
Taxes would be at least equal to cigarettes in local markets. And there are already black markets blossoming in certain areas of the country due to those high cigarette taxes.
Making, storing, transportation and distribution are all much more difficult trying to produce black market alcohol than marijuana.