These weapons are carried by worried boys for "protection", say youngsters - and researchers link this to increased affluence among teenagers.
This portrait of teenage life, based on a survey of 70,000 youngsters, shows considerable fears of bullying.
Getting drunk is also a habit for a quarter of 14 to 15 year old girls.
This survey from the Schools Health Education Unit has been examining the lifestyles of young people since the mid- 1980s.






