ATLANTA — Unlike Las Vegas, what happens in New York City doesn’t always stay in New York City.

It spreads.

Just months after the Big Apple made it illegal to serve sugary drinks larger than 16 ounces in restaurants, movie theaters and delis, other cities also are considering putting restrictions on soft drinks, part of a multi-front effort to address American’s growing obesity problem.

It’s a move that, if it picks up steam, could rock the multi-billion-dollar industry that’s led by Atlanta-based Coca-Cola. Carbonated drinks — for the most part, sodas — constitute almost half of the industry’s business and almost 24 percent of drinks in movie theaters and restaurants.

That’s left the beverage industry scrambling, sinking millions into media campaigns that portray the measures as Big Brother interfering in personal choice. The industry also has filed a lawsuit challenging New York’s law and is stepping up its efforts to put calorie counts on vending machines and to offer sodas in smaller cans.

“The reality is the decision in New York that affirmed Mayor (Michael) Bloomberg probably gives mayors in other cities a way to make a statement like that,” said Tim Mescon, an economist and president of Columbus State University.

Since 2009, municipalities across the nation and around the world have launched efforts to either tax or limit sugar-sweetened drinks in some public buildings, schools and even churches, according to the Yale Rudd Center for Food Policy and Obesity.

On any given day, about half of the population over the age of 2 consumes a sugary drink, according to a Centers for Disease Control report. At the same time, Americans are heavier now than ever. A recent report by Trust for America’s Health found that, by 2030, the U.S. could have an adult obesity rate above 44 percent.

Members of Washington D.C.’s City Council said in October that they may soon follow New York’s lead with restrictions of their own. And Henrietta Davis, the mayor of Cambridge, Mass., the home of Harvard University, proposed restrictions similar to New York’s in June.

Leaders at Coca-Cola declined to comment on the latest efforts to curb the consumption of sodas, referring all questions to the American Beverage Association, the industry’s lobbying arm. But in June, when Bloomberg announced the restrictions, Coca-Cola was quick to comment.

“New Yorkers expect and deserve better than this,” the company said. “They can make their own choices about the beverages they purchase. We hope New Yorkers loudly voice their disapproval about this arbitrary mandate.” Company representatives have met with Washington, D.C. officials to discuss their concerns about Coke products and its role in obesity.

Already, Coca-Cola had been taking steps to better diversify its portfolio with less sugary products. The beverage giant has seen sales of its carbonated drinks drop over the past decade as Americans have become more conscious about what they drink and attempted to eschew sugar.

For the past five years, the company has offered more teas, waters and reduced sugar drinks. Now, Coca-Cola has 800 low- or no-calorie options, said a recent global sustainability report.

At the same time, the Coca-Cola Foundation has donated millions to organizations that promote exercise, including most recently the Association of C5 Youth Programs in Atlanta, which received $50,000, and the Center Helping Obesity in Children End Successfully in Kennesaw, Ga., which was given $25,000.

The impact New York’s size limitation could have on Coca-Cola’s bottom line is unknown because it hasn’t gone into effect. Once it does, the company will know how the public will react, whether they’ll now buy two soft drinks instead of one, or adapt and settle for drinking less.

Michael F. Jacobson, in an October editorial for The Huffington Post, said Coca-Cola’s marketing, as well as rival Pepsi’s, has made their products indispensable.

“Soda might have been a source of happiness when it was served occasionally in 6.5- or 10-ounce bottles,” wrote Jacobson, executive director for the Washington, D.C.-based Center for Science in the Public Interest. “But in its current form — the default, everyday drink at dinner, lunch and, increasingly, breakfast for so many people and in 20-ounce bottles or 32- or 64-ounce vats — soda is actually a powerful promoter of obesity, tooth decay, diabetes, heart disease and other problems.”