The FDA is expanding its investigation into E-Cigarettes.
The agency is now targeting 21 e-cigarette companies to find out if they've been marketing products illegally.
The move comes less than two weeks after the FDA conducted a surprise inspection of e-cigarette maker Juul's Corporate Headquarters in San Francisco.
Agents seized thousands of documents many relating to sales and marketing.
The investigations are part of the FDA's crackdown on teen e-cigarette use.
FDA expands E-Cigarette investigation