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cannabis use cannabi adolescent problem study parent model youth tobacco substance alcohol substance use dutch health onset moroccan population level health problems temperament netherland behavior signi fi ndings scale score difference cannabis-using peers psychiatry experience trauma association acculturation university pleasure research psychosi effect af filiation problem behavior factor interaction sample child signi ficantly group nding externalizing psychopathology behaviour participant development adolescence control children tobacco use trail analyses addiction cannabis-using ficant shynes offender proportion substance-using peers parent –child conflict internalizing psychol dimension filiation van os j liability disorder drug use alcohol use center report mediation cape score symptom