FDA warns four companies over social media posts

Federal regulators sent warning letters to four e-cigarette companies for failing to follow advertising rules in social media posts.

The influencer endorsements on Instagram, Facebook and Twitter neglected to include the required nicotine warning, the Food and Drug Administration and the Federal Trade Commission announced Friday in a joint statement, according to a story in the Washington Post.

The posts invited followers to try the liquid capsules, which come in an array of flavors, used in vape pens. The FTC, which polices unfair and deceptive corporate practices, said promotions lacking health-risk disclosures could be in violation of federal law, according to the story.

The agencies sent warning letters to Solace Technologies, Hype City Vapors, Humble Juice Co. and Artist Liquid Labs.