Teenagers who interact positively with their family, school and friends are far less likely to smoke, binge drink and use cannabis than peers who fail to identify with these social groups, according to research. The research team surveyed more than 1000 high school pupils aged 13-17 from the Fife area. The results showed that group identification protects against adverse health behavior, with levels of identification with family, school and friendship groups predicting the likelihood of teenagers having smoked cigarettes, drank to excess or smoked cannabis in the past month.