> If they're extracting some ingredients from cow dung then I think it could hurt them.

Possibly, but people seem pretty resistent to these types of things. Red die being crushed up bugs. Everything in cigarettes. 90% of the ingredients in non-fresh foods. Pesticides on fresh foods. McDonalds....

Coke isn't exactly good for you and I think most people know that. And I think the "eww" factor would have to be pretty horrifying to make people stop drinking it.