'Oh yeah, that's already happening'
Can you document that with legitimate citations?
If Fed government matched a reduction in the sugar import tariff which subsidizes US sugar production, with a national sugar tax on carbonated beverages, then theoretically at least, consumers would see no impact, government could raise a few billion pennies, and Florida's sugar cane workers would just have to work a little harder....everything has consequences. At least having a Fed tax stamp on sodas would make it possible to measure how much soda is coming in from outside the country where there is no FDA, although, in truth, foreign sugar soda is probably healthier than HFCS US soda, which is semi-toxic.
Federal incentives are being given to US sugar producers in the form of import tariffs to keep out Brazilian and Thai sugar. That costs every one of us, not just soda drinkers. I say, as a parent who has seen what 'Hansen's Natural' JOLT drinks do to kids, tax them until their gums bleed!!