The FDA authorized the marketing of 20 Zyn products on Thursday, marking the first allowance for the fast-growing nicotine pouches.

The pouches are used by less than 2% of US teens, the FDA said in granting the application allowing them to continue to be sold.

The FDA authorized the marketing of 20 different Zyn nicotine pouch products -- the first brand to clear this regulatory hurdle in the increasingly popular class of single-use sachets of flavored nicotine designed to be placed between the lip and gums, which have been available for more than a decade.