Children who smoke cannabis are twice as likely to offend
Children who smoke cannabis are twice as likely to get into trouble - both in the classroom and outside the school gates.
Boys turn to vandalism, theft and fights, while girls misbehave at school, a four-year study of thousands of pupils aged between 11 and 15 found.
Young males are also up to twice as likely to have committed "delinquent" acts such as vandalism or carrying a knife.