Adolescents from the highest family socio-economic status categories are at risk for tobacco and cannabis experimentation but are less prone to engage in daily use. Psychological and social mechanisms that inhibit transition to daily use should be investigated, including school attainment and performance.

Cannabis use is rarely a trigger for grade repetition but can have either damaging or positive effects on school attainment depending of the level of use. Positive social competence reflected by peer initiation should be investigated to understand this paradoxical effect.

Background: This study investigates the association of the family occupational category (F-OC) with

The main implication of our findings is to sensitize parents and stakeholders about the limitation of ST, including their own use that adolescents are likely to mimic. Alternative measures such as off-line time should be encouraged.

No abstract