More than 45,000 students in Hong Kong participated in the study. Data was collected between 2012 and 2013.
Of the sample population, 1.1 percent of students reported e-cigarette use within the past 30 days. Those students were 30 percent more likely than their peers to report respiratory problems.
The results are suggestive but not definitive. Dr. Norman H. Edelman, senior consultant for scientific affairs for the American Lung Association, found the study intriguing.
“It’s important [but] we need to know if the lungs are injured. It’s not clear if this really affects the lungs. We’re not sure what the symptoms are,” Edelman told Healthline.
He wondered if the young subjects were reporting soreness in their throats, excessive coughing, or difficulty breathing. He would like to see a follow-up study, perhaps in the United States.
We don’t know what the negative effects are. This is just a beginning.
Dr. Norman H. Edelman, American Lung Association
“We need to do lung function tests,” he said.
“Whenever you breathe in something, you don’t know what’s in it. Some of the data suggest irritation,” Edelman said. “We don’t know what the negative effects are. This is just a beginning.”
E-cigarettes and vaporizers use liquids that have varying amounts of nicotine or none at all. These liquids are not regulated by the U.S. Food and Drug Administration (FDA), but generally also contain propylene glycol, a suspected lung irritant, and vegetable glycerin.
“While supporters [of e-cigarette use] are optimistic about the potential for harm reduction in the minority of established cigarette smokers, [for] which convincing evidence is lacking, this does not seem to justify the potential harm of renormalizing cigarette smoking, delaying smoking cessation, and escalating to real cigarette smoking, especially among the majority of non-smoking young people,” Edelman said.