Federal health officials on Thursday backed the public health benefits of nicotine pouches, authorizing Philip Morris International’s Zyn to help adult smokers cut back or quit cigarettes.

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.

Following an extensive scientific review, the U.S. Food and Drug Administration has authorized the marketing of 20 ZYN nicotine pouch products. Nicotine pouches—small synthetic fiber pouches containing nicotine—are designed to be placed between a person's gum and lip.