council declar decemb european drug prevent week council european union note commiss commun assess european drug prevent week regard lesson learnt european drug prevent week novemb consid organ european drug prevent week octob commiss activ field make effect visibl contribut cooper europ consid context special attent devot effect evalu measur aim last primari prevent target young peopl call commiss member state commenc prepar european week network nation coordin nation organ committe