are ad's for soda ethical?

psfk recently had a post stimulating discussion on whether or not W+K's ad work for Coca-Cola is similar to ad work for tobacco companies. They ask "should ad agencies have a similar moral decision when it comes to soda as they do tobacco?" Referring to the fact that Coke's cool package design is part of the reason that kids drink to much soda and then have health problems because of it. There's some good responses from readers on the issue.