Five years later, Philadelphia’s soda tax is falling flat

Five years ago , Philadelphia politicians decided to impose a soda tax on soda sales.

Bob Greene : The tax would "reduce obesity" and "lower diabetes rates" Greene: Soda taxes are disproportionately paid by poor people.

Greene: "We're raising enough money to put 2,700 kids in pre-K and to open 11 community schools!" He says soda tax had an unintended consequence: Alcohol sales rose 5 percent .