The EC said decisions on the international scheduling of substances fall under the exclusive competence of the EU, and the European Council's decision determining the EU position is binding on member states.

The commission also noted that Hungary had voted contrary to the EU position twice during the vote on World Health Organisation recommendations on cannabis and cannabis-related substances.

The CND voted to remove cannabis from Schedule IV, clearing the way for recognizing the medicinal and therapeutic potential of the drug, although keeping its non-medical use illegal.

The EC said Hungarian authorities' response in the matter to a "reasoned opinion" – the second and penultimate step of an infringement procedure – was "unsatisfactory".