The Supreme Court on Monday pressed the Food and Drug Administration on whether it followed the law in its effort to keep flavored e-cigarettes off shelves, weighing a lawsuit from a multibillion-dollar industry that has come under scrutiny because its products are popular with school-aged children.

Supreme Court justices grappled Monday with arguments about the Food and Drug Administration’s (FDA) regulation of flavored electronic cigarettes — and whether the agency acted unfairly in its

If the FDA loses, the agency could decide to release fewer guidance documents, which give companies insight into its thinking.