This thesis, entitled “Drug trafficking under the aggravating circumstance of acting professionally with the expectation of making a profit over EUR 75,000”, examines the offence of drug trafficking under article 23 (2) (a) of act 4139/2013. It is divided into three parts: aspects of substantive law, aspects of procedural law and the legal approach of addicted drug dealers. The thesis undertakes a comparative analysis of legal theory and Supreme Court recent case law with a view to underscoring the specificities of the new provision and the difficulties in its application as well as the differences in relation to the previous legal framework.