Negative emotions and aversive feelings are one of the main risk factors in the process of achieving and maintaining drug abstinence. In this thesis, we focused on both the individual's ability to tolerate such unpleasant internal states of being as well as their persistence in performing goal-oriented tasks despite experiencing distress. We studied the association between two aspects of the distress tolerance construct (behavioural and self-perceived), positive mental health and social support, as well as any differences in selected variables with respect to some indicators of abstinence success in individuals involved in addiction treatment. The participants involved in the study included 19 adults (7 women) from 21 to 63 years of age who attended addiction treatment programmes at Društvo projekt človek. In a group setting, all the participants completed a questionnaire on their demographics, history of drug use and abstinence, social support, and positive mental health along with the Distress Tolerance Scale, which was adapted for this Slovenian sample. Individually, participants took part in a computerised version of the Paced Auditory Serial Addition Task (PASAT-c), which was used to measure behavioural distress tolerance. All associations between these measured variables were statistically insignificant. Taking into account the limitations and poor generalisability, the results may suggest a low positive association between the behavioural and self-perceived distress tolerance, whereas slightly higher associations were found between self-perceived distress tolerance and positive mental health as well as between social support and the duration of treatment engagement. Those participants who reported past abstinence attempts had a significantly lower self-perceived distress tolerance than those who has not done so in the past. The results might also suggest that there are differences between the measured variables in regard to the presence of a lapse between their current treatment and previous involvement in treatment programmes. These deviations did not prove to be statistically significant. This study may provide a direction in terms of further research concerning distress tolerance, the added value of which is becoming increasingly recognised in the field of addiction treatment and abstinence maintenance.
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