Jurisdictions around the world have been implementing taxes on sugar-sweetened beverages.
Hunt Allcott, Benjamin B. Lockwood, and Dmitry Taubinsky focus on studies of the eight US jurisdictions that have adopted such a tax, along with the broader literature on causes and costs of obesity, in "Should We Tax Sugar-Sweetened Beverages? An Overview of Theory and Evidence" in the just-released Summer 2019 Journal of Economic Perspectives. (Full disclosure: I'm the managing editor of JEP, and thus predisposed to believe that the articles are of high quality and widespread interest.) Here's their table of the US jurisdictions that have imposed a tax on sugar-sweetened beverages.
Making the case for (or against) a tax on sugar-sweetened beverage requires addressing a number of questions.
This may seem like a lot of complications for answering a question about a small-scale policy. But for those who want a serious and actual answer , these kinds of questions can't be avoided. I won't try to summarize all the points of the paper, but the tone of answers can be inferred from the bottom line:
[W]e estimate that the socially optimal sugar-sweetened beverage tax is between 1 and 2.1 cents per ounce. One can understand this as coming from the correction needed to offset the negative externality (about 0.8 cents per ounce) and internality (about 1 cent per ounce ... Together, these rough estimates suggest an optimal tax of about 1.5 cents per ounce. While there is considerable uncertainty in these optimal tax estimates, the optimal tax is not zero and may be higher than the levels in most US cities to date. However, for policymakers who are philosophically opposed to considering internalities in an optimal tax calculation, the optimal tax considering only externalities is around 0.4 cents per ounce. ...
[W]e estimate that the social welfare benefits from implementing the optimal tax nationwide (relative to having zero tax) are between $2.4 billion and $6.8 billion
per year. These gains would be substantially larger if the tax rate were to scale with sugar content. Of course, such calculations require strong assumptions and depend on uncertain empirical estimates ... Furthermore, sugar-sweetened beverage taxes are not a panacea—they will not, by themselves, solve the obesity epidemic in America or elsewhere. But sin taxes have proven to be a feasible and effective policy instrument in other domains, and the evidence suggests that the benefits of sugar-sweetened beverage taxes likely exceed the costs.
Timothy Taylor is an American economist. He is managing editor of the Journal of Economic Perspectives, a quarterly academic journal produced at Macalester College and published by the American Economic Association. Taylor received his Bachelor of Arts degree from Haverford College and a master's degree in economics from Stanford University. At Stanford, he was winner of the award for excellent teaching in a large class (more than 30 students) given by the Associated Students of Stanford University. At Minnesota, he was named a Distinguished Lecturer by the Department of Economics and voted Teacher of the Year by the master's degree students at the Hubert H. Humphrey Institute of Public Affairs. Taylor has been a guest speaker for groups of teachers of high school economics, visiting diplomats from eastern Europe, talk-radio shows, and community groups. From 1989 to 1997, Professor Taylor wrote an economics opinion column for the San Jose Mercury-News. He has published multiple lectures on economics through The Teaching Company. With Rudolph Penner and Isabel Sawhill, he is co-author of Updating America's Social Contract (2000), whose first chapter provided an early radical centrist perspective, "An Agenda for the Radical Middle". Taylor is also the author of The Instant Economist: Everything You Need to Know About How the Economy Works, published by the Penguin Group in 2012. The fourth edition of Taylor's Principles of Economics textbook was published by Textbook Media in 2017.