Teens who used e-cigarettes and hookah were up to four times more likely to use marijuana later, according to a study published Monday in the journal Pediatrics.
Researchers from the University of Pennsylvania and the University of Southern California surveyed 2,668 students at 10 public high schools in Los Angeles beginning in fall 2013, when they were 14 years old and in ninth grade.
The students answered a paper-and-pencil, phone or internet survey that asked whether they had ever used (or had used in the past 30 days) e-cigarettes, combustible cigarettes or a hookah water pipe. They were also asked whether they had used any type of marijuana product. The use of less popular tobacco products such as smokeless tobacco and cigars was not studied.
In a follow up survey in fall 2015, when the students were 16 years old and in 11th grade, the survey asked whether they had used three types of marijuana products: combustible, vaped or edible.
The researchers found that the students who had tried e-cigarettes when they were freshmen had a more than three-fold greater likelihood of ever using marijuana and using marijuana in the past 30 days than students who hadn’t tried e-cigs.
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