In my new book, I tried to highlight the problematics of problem gambling from various points of view. I have sought to apply economic and psychological examination methods at all times. Since the technical literature is continuously growing, I have tried to take into consideration the newest research results up to the moment of closure. I have expanded the theoretical dissertation with personal investigations in each subchapter, which were established on primary and secondary data sources depending on the topic. The objective of my paper is the introduction and examination of gambling behaviour - appearing as a harmful passion.