But the conservative 5th U.S. Circuit Court of Appeals sided with Triton, agreeing that the FDA changed its standards with little warning in violation of federal law.
While mainly ruling for the FDA on Wednesday, the Supreme Court noted that the agency had said the company's marketing plan would be an important factor in evaluating its application. But it ultimately did not consider the marketing plan, Justice Samuel Alito wrote for the court.
The appeals court was ordered to consider if the failure to do so is an important mistake that might still lead to a decision in Triton's favor.
The FDA has so far not instituted changes to its polices on vaping. But on Tuesday, the FDA's top tobacco regulator, Brian King, was removed from his post amid sweeping cuts to the federal health workforce that have cleared out many of the nation's leading health experts. King oversaw hundreds of warning letters issued to companies that make, sell and distribute flavored vapes.