An Indiana family is suing Juul Labs Inc., accusing it of making electronic cigarettes that contain excessively high levels of nicotine without warning that they're addictive.

According to this year's National Youth Tobacco Survey, 3.6 million teens are using e-cigarettes. That's up 78 percent from last year.

FDA Commissioner Scott Gottlieb said the agency is conducting an undercover, nationwide blitz this month to try and stop the sale of e-cigarette products to minors.