By the time everyone gets their "cut" of the taxes, the price for legal pot will be too high for local folks to buy and they will return to buying from the black market. The only folks who will buy and pay the price are tourists off cruise ships who have no where to smoke it. Maybe a few folks who need it for medical purposes with pay the higher price too. 
Locally, in Ketchikan, our Borough government is looking at taxing the sales at 10% minus 5% if they are paying the City's tax on pot (at least I think that is the idea but it's confusing). They want to use the tax money to fund requests by non-profits that use to come from the now depleted economic development fund. 
This summer the two shops here really missed out on extra sales to cruise ship passengers because there was no legal place they could go to smoke it. 
Maybe only the growing part should be taxed and no retail store sales taxed to encourage buying locally grown and regulated pot instead of off the black market. Taxes🤔