Gambling addiction is considered one of the most difficult types of addiction, but there are not enough findings in the literature about the impact of currency changes on the behavior of gambling addicts. In most countries where the euro was introduced, the illusion of the euro developed, that is, when spending money, consumers relied on the nominal value of the new currency to make purchasing decisions. Therefore, the question arises whether this phenomenon also manifested among gambling addicts after the introduction of the euro in the Republic of Croatia. The aim of this paper was to determine the psychosocial consequences that the adoption of the euro had on gambling addicts in the Republic of Croatia. With the help of conducting in-depth interviews with 18 patients who, at the time of the research, were being treated for gambling addiction at the Psychiatric Hospital of St. Ivan in Zagreb and in the Club of Gambling Addicts in Split, an insight into the psychosocial consequences that the adoption of the euro had on them was gained. The research confirmed the appearance of the euro illusion, which resulted in an increased spending on gambling. This consequently increased the negative impact on the respondents' mental health, their relationships with family and friends and their work.