If teens are vaping nicotine, it's likely they're also using cannabis-based e-cigarettes and vice versa, according to a new analysis published Tuesday by JAMA Network Open.

The survey of more than 3,000 adolescents and teens from 10 high schools in the Los Angeles area found that older teens who identified as frequent users of nicotine vaping devices were 25% more likely than others to be moderate users of cannabis e-cigarettes.