The U.S. Supreme Court listened to arguments regarding the FDA's handling of banned e-cigarette flavors.

The Supreme Court on Monday heard arguments about the federal regulation of flavored e-cigarettes, in a case pitting the Food and Drug Administration (FDA) against two vaping companies. Justices weighed whether the agency acted lawfully when it denied the applications of the companies to market fruity and dessert-flavored liquids for their electronic nicotine products.

A majority of Supreme Court justices didn't seem convinced Monday that federal regulators misled companies before refusing to allow them to sell sweet-flavored vaping products following a surge in teen e-cigarette use.

Food and Drug Administration has rejected more than a million vaping products flavored to taste like fruit, candy or desserts.

As e-cigarettes have flooded the market, the FDA's role in approving new tobacco products is put under a microscope.

Makers of flavored e-cigarettes brought various cases challenging the FDA’s decision to refuse approval and alleged the agency changed its standards of evaluation on short notice. NBC News’ Lawrence Hurley reports why the court,

On Monday, the Supreme Court heard arguments in a pivotal case concerning the regulation of flavored e-cigarettes. The vaping industry, which has brought the case forward, contests the Food and Drug Administration's restrictions on flavored vaping products,

The FDA is attempting to crack down on teen vaping, saying the flavored vapes are aimed at young users. WASHINGTON — The Supreme Court will hear a vaping case on Monday, weighing federal regulators’ decisions blocking sweet vaping products after e-cigarette use spiked among kids.