In a unanimous decision on Wednesday, the Supreme Court rejected an appeals court's conclusion that the Food and Drug Administration (FDA) violated the

Companies had sued the FDA, saying it unfairly shifted its standards for approving e-cigarette liquids popular with teens. The Supreme Court unanimously backed the agency.

The U.S. Supreme Court on Wednesday largely backed the U.S. Food and Drug Administration's refusal to let two e-cigarette companies sell flavored vape products that regulators consider a health risk to youths.