"At-school substance use is not just an isolated event requiring simple disciplinary action but an important signal identifying teens in need of urgent psychosocial assessment and support," said study author Dr Rebecca Dudovitz. She is an assistant professor of paediatrics at Mattel Children's Hospital UCLA and the UCLA Children's Discovery & Innovation Institute.
The researchers looked at statistics from a 2011 government survey of more than 15 000 US high school students.
9% of the students said they'd used alcohol or pot at school. These kids were dramatically more likely to suffer from other unhealthy behaviours such as driving while intoxicated or riding in a car with an intoxicated driver; fighting; carrying a weapon at school; and experiencing domestic violence from an "intimate partner". Other problematic behaviours that were more likely: being forced to have sex; showing symptoms of depression; thinking about suicide; and attempting suicide.
"When a student is found using substances at school, we should think of it as a sign that a child needs help," Dudovitz said in a news release from the American Academy of Paediatrics.
"Given the strong association of at-school substance use with some very serious and dangerous health risks, like having experienced sexual trauma and attempting suicide, we should not dismiss at-school substance use as just another school infraction," Dudovitz said. "Instead, it may be a truly urgent call for caring adults to get involved and help that student access appropriate services."
The findings are to be presented at the annual meeting of the Paediatric Academic Societies in Vancouver, Canada. Data and conclusions presented at meetings are typically considered preliminary until published in a peer-reviewed medical journal.