(CNN) One in four teens who vape say they've used e-cigarettes for an alternative technique known as "dripping," new research finds. Dripping produces thicker clouds of vapor, gives a stronger sensation in the throat and makes flavors taste better, according to a study, published Monday in the journal Pediatrics. "This study is the first systematic evaluation of the use of dripping among teens," said Suchitra Krishnan-Sarin, lead author and a professor in the department of psychiatry at the Yale University School of Medicine. Krishnan-Sarin and her colleagues surveyed teens from eight southeastern Connecticut high schools during spring 2015. Though some respondents did not answer all the questions, 1,874 students reported having tried an e-cigarette. More than 26% of those who'd tried vaping also reported dripping.Vapers are more likely to spill liquids while dripping and so they risk exposure to toxic nicotineSome chemicals released are associated with cancer, chronic obstructive pulmonary disease
According to Krishnan-_, "Emerging data is also showing that e-cigarettes contain many other chemicals like propylene glycol and glycerine, and they also contain a lot of flavor chemicals.