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The study aims to identify existing links between cannabis use and irregular immigration among young Tunisians (n = 131) and to explain the emergence of these phenomena, by examining the need to belong and positive dispositions, including optimism and belief in a just world. Results have shown that both behaviours seem to be powered by psychosocial and positive processes alternately convergent and divergent. It also appears that the more cannabis consumption increases, the more the young become likely to engage in irregular migration. Building positive skills among young people through group activities frameworks that offer an environment of acceptance, and a stable relationship network could constitute a promising approach to prevent cannabis use and irregular migration.