Why are teens engaging in less risky behaviour?

Recent research has found a dramatic decline in risky behaviours among adolescents in the last two decades. They're having less sex, smoking fewer cigarettes and cannabis, and drinking less alcohol than teens 20 years ago. Dr Jude Ball is a research fellow at the University of Otago, Wellington, whose doctoral thesis, published a couple of months ago, explores the change and what might be driving it. She says some of the findings are good news for parents, but not all.