Australia's teenagers are increasingly becoming trapped in a culture of booze, drugs and gambling that is disrupting classrooms, stretching resources and contributing to mental health, violence and bullying.
New studies show that high school students are bringing their problems to school after weekend bingeing and that children as young as 12 are learning to gamble.
But Australian society tended to accept alcohol abuse as normal compared to the use of illicit drugs, "an aspect of the cultural position that needed to be addressed", a National Council on Drugs survey of more than 200 public, private and religious schools said.
Principals told the survey that students arrived on Monday mornings scarred by extreme drunkenness, unprotected sex and other issues from weekend binges that left schools to deal with "major fall-out".
They said significant amounts of time were already being spent by teachers trying to help students catch up on their work. But schools were struggling with shortages of people, funding and time.