Cannabis is the most commonly used recreational drug by teenagers around the world. In England four per cent of youngsters aged between 11 and 15 have used cannabis in the last month while in Canada more than 20 per cent of 15 to 19-year-olds used cannabis over the past year.
Researchers from the University of Oxford and McGill University in Canada analysed data from 11 previous studies involving more than 23,000 people to see if using cannabis in adolescence was linked with depression. Young people who had already shown signs of depression or had a family history of depression were excluded.
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