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An average New Yorker goes to the movies about four times per year and buys concessions only twice, said Sun Dee Larson, a spokeswoman for the AMC Theatres chain.

“We firmly believe the choices made during the other 363 days have a much greater impact on public health,” she said in a statement.

Thursday’s vote is unlikely to be the final word on the proposal.

A soft-drink industry sponsored group called New Yorkers for Beverage Choices — which says it has gathered more than 250,000 signatures on petitions opposing the soda plan — is considering a lawsuit and exploring legislative options for challenging the plan if it passes, spokesman Eliot Hoff said. It’s not clear what legislative routes there may be: City Council Speaker Christine Quinn said Wednesday she’s not interested in trying to block the expected health board vote, though she has said she isn’t a fan of the soda idea.

The rule wouldn’t apply to lower-calorie drinks, such as water or diet soda, or to alcoholic beverages or drinks that are more than half milk or 70 percent juice.

Enforcement would be conducted by an existing corps of city restaurant inspectors. A violation would lead to a $200 fine.