Abstract
There is a high prevalence of gambling harms co-occurring with substance use harms. Where harms are co-occurring, they may be experienced as more severe. However, there is little evidence that services are systematically screening for such co-occurring harms in treatment-seeking populations. Furthermore, treatment modalities remain relatively under-developed, with treatment usually addressing only one source of harm.
This scoping review looks at the current literature on screening and therapeutic interventions for co-occurring gambling and substance use harms to understand how co-occurring harms may be managed in a treatment setting. It draws together available data on the intersections of substance use harms and gambling related harms, in a treatment context.
This research identifies a range of potentially useful validated tools for clinicians in substance use treatment settings to screen for gambling harms. For workers in gambling treatment settings who are seeking validated tools to screen for co-occurring substance use harms, the literature provides less guidance.
The validated toolbox of therapeutic interventions for those experiencing co-occurring substance use and gambling harms is relatively sparse. Psychosocial interventions appear to offer the best outcomes on gambling measures for those experiencing co-occurring substance use harms. Further research is needed to establish the benefits of different combinations of treatment and treatment types in achieving reductions across both substance use and gambling harms, when these harms are experienced concurrently.
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Introduction
Both gambling and substance use have a range of consequences that may, for a subset of the population, be experienced as harms (Kourgiantakis et al., 2021). The harms associated with gambling and substance use can be severe and tend to be cascading, such that one form of harm can precipitate and exacerbate other forms of harm (Eby et al., 2016; Algren et al., 2018; Langham et al., 2016; Loxley et al., 2004). Harms are not evenly distributed or experienced across the population, and individuals experience different risk factors that may make them more or less likely to experience harms. Experiencing harms from substance use can increase the risk of experiencing gambling harms and vice versa (Grant & Chamberlain, 2014). The co-occurrence of substance use harms and gambling harms is well established in the literature (Cowlishaw et al., 2014; Johansson et al., 2009). A systematic review and meta-analysis of available population surveys found that 57.5% of individuals experiencing gambling harms experienced co-occurring substance use harms (Lorains et al., 2011). Individuals who have a lifetime experience of gambling harms are up to 7 times more likely to experience substance use harms than non-gamblers or those assessed as ‘recreational gamblers’ (Grant & Chamberlain, 2020). Conversely, those with a lifetime experience of substance use harms may be as much as 10 times more likely to experience gambling harms than the general population (Potenza et al., 2002).
Co-occurring substance use harms and gambling harms can be a complicating factor in treatment and can result in poorer treatment outcomes (Wieczorek & Dąbrowska, 2023; Dowling et al., 2015). Individuals experiencing both substance use harms and gambling harms are more likely to cease treatment prematurely (Milton et al., 2020). Some studies have found evidence of ‘addiction substitution’ whereby successful treatment for one form of harm may, in particularly vulnerable populations, precipitate other potentially harmful behaviors (Kim et al., 2021). Offering holistic screening and therapeutic interventions that capture harms from both substance use and gambling can be an efficient and cost-effective way to reach a high-risk population and to reduce net harms (Christo et al., 2003). However, there is little evidence that a holistic approach is currently used in addressing such co-occurring harms (Sherba & Martt, 2015; Wolinski et al., 2003; ATODA, 2022). A 2020 Australian study that addressed the capacity of mental health clinicians (including those working in alcohol, tobacco and other drug [ATOD] services) to respond to gambling harms, found that most had ‘limited knowledge of screening tools to detect PG [problem gambling]’ (Manning et al., 2020). In the same study, only 16% of clinicians were found to screen ‘often’ or ‘always’ and few expressed confidence in their ability to provide appropriate therapeutic interventions for gambling harms. Only 12.5% reported receiving training in gambling harms, and those that had, displayed higher levels of knowledge about gambling (in the context of mental illness), more positive attitudes about responding to gambling issues, and more confidence in screening for or detecting gambling harms (Manning et al., 2020). Although this study was not specific to the ATOD sector, the broad findings around inadequate screening and low confidence in ability to respond to gambling harms are likely to be mirrored in the ATOD workforce. In the past, very few specialist ATOD treatment services have provided gambling treatment to service users (Wolinski et al., 2003). ATOD workers have identified gambling as a significant training gap (ATODA, 2022). In a qualitative study of ATOD service users in Ohio, almost two-thirds of participants reported gambling in the 6 months prior (Sherba & Martt, 2015). Of these participants, only 22.2% reported ever having been asked about gambling while receiving ATOD treatment services and just 12.5% reported ever having had gambling treatment services offered to them.
This review seeks to understand how co-occurring substance use and gambling harms are being managed in treatment settings. It draws together available data on the intersections of substance use harms and gambling related harms in a treatment context with the aim of establishing an evidence base on which services can begin to build best practice approaches for responding to such co-occurring harms.
Methods
In January 2023, the authors completed a scoping review of the available literature on screening and therapeutic interventions in respect of co-occurring substance use and gambling harms. The review formed the first phase of a broader project aiming to identify and support services to implement best practice approaches in responding to co-occurring substance use and gambling harms. As such, the review was intended to scope for:
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a)
validated screening tools for co-occurring substance use harms and gambling harms; and.
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b)
current practice in therapeutic responses for co-occurring substance use harms and gambling harms.
This process would allow the authors to develop a broad understanding of how services might appropriately respond to the presentation of co-occurring substance use harms and gambling harms. A scoping review was undertaken to collate data where the available evidence and parameters of the field remained largely unknown and unexplored (Munn et al., 2018).
In undertaking this study, the authors utilized a method modified from the Preferred Reporting Items for Systematic Reviews and Meta-Analysis Protocols for Scoping Reviews (PRISMA-ScR). This review draws on the guidelines for conducting systematic scoping reviews developed by the Joanna Briggs Institute (Peters et al., 2015, 2020; Tricco et al., 2018). The method broadly involves three stages: identification of records; screening of records; and inclusion of records for data extraction. The steps undertaken across these three stages are outlined in Fig. 1.
Identification
A search strategy was developed with advice from an academic research consultant at a university library. Two academic databases were chosen: PubMed and Scopus. The use of only two databases is a limitation of the study that may be addressed in future research. The PubMed search strategy is shown in Table 1.
Results from the search of databases included literature spanning the disciplines of healthcare, neuroscience, psychiatry, psychology, social work and other social sciences. Results were exported into EndNote and duplicates were removed using the protocol developed by Bramer et al. (2016). In addition to records removed in EndNote, the authors detected and removed 17 duplicate records during the review process.
It was anticipated by the authors that reports, practice guidelines and treatment manuals would provide a rich source of supplementary data. To capture this grey literature a secondary search of Google was undertaken. Results were examined systematically up to, and including, page 30 (300 results generated), as recommended by Haddaway et al. (2015; Piasecki et al., 2018). Where links led to academic articles, these were automatically exported into Endnote; where links were directed to organisational or government websites, a further search was conducted of publications appearing on these sites. Searches were restricted to articles published after December 2001.
Screening
Inclusion and exclusion criteria were developed by the authors and applied to the articles that remained after de-duplication. Screening involved three stages (a) screening of titles; (b) screening of abstracts; and (c) screening of full-text articles. Articles included for data extraction met the criteria of being in English and about screening and/or therapeutic interventions for gambling and/or substance use harms where such harms were identified as co-occurring. Articles were excluded where the substance use harm referred primarily to tobacco smoking or vaping; where the research was wholly or primarily an animal study; where the focus of the study was on Parkinson’s disease; or where the authors were concerned with the neurobiological underpinnings of addiction. Letters to the editor, editorials (including introductions to special issues) and other forms of commentary were excluded. After identifying relevant cited material, reviews were excluded except where they offered additional analysis.
All papers identified during the screening process and included as eligible for data extraction were grouped into one of three categories: screening; therapeutic intervention; and both screening and therapeutic intervention.
Inclusion for Data Extraction
The response to co-occurring harms is considered, in this review, to be a two-phase process involving (1) screening and (2) therapeutic intervention. Screening allows a clinician to identify individuals experiencing (or at risk of experiencing) substance use or gambling harms and, in some cases, to assess the degree of harm being experienced. Screening provides a necessary first step prior to in-depth diagnostic assessment and therapeutic intervention. Therapeutic interventions are varied and can include both on-referral or treatment in the service setting.
To scope current practice in screening of co-occurring substance-use and gambling harms, the authors looked at the range of validated tools that have been used to screen or otherwise assess for the following:
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gambling/gambling harms in an ATOD treatment setting;
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substance use/substance-use harms in a gambling treatment setting;
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both gambling/gambling harms and substance use/substance use harms in a treatment setting, amongst a treatment-seeking population (including primary health care) or in the general population.
To scope current practice in therapeutic interventions for co-occurring substance-use and gambling harms, the authors looked at validated tools or working models that offered possible treatment or other intervention for the following:
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gambling treatment (or other therapeutic intervention) where there was co-occurring substance use harm;
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substance use treatment (or other therapeutic intervention) where there was co-occurring gambling harm;
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treatment (or other therapeutic intervention) that targeted both gambling and substance use, where harms were co-occurring.
Results
A search of the databases and search engine identified 3,868 unique articles (following de-duplication). After screening, 32 articles were included for extraction. These referred to either screening (n = 20); therapeutic intervention (n = 10); or both screening and therapeutic intervention (n = 2).
Screening
Across the dataset, 19 screening tools were identified (see Table 2). These tools screened for:
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gambling in substance-use treatment settings or, in other treatment settings where there was a significant clinical caseload of substance-use treatment needs (n = 11).
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both gambling and substance use and were validated across a range of settings and/or populations (n = 4).
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underlying behavioral traits or risk factors in the general population (n = 4).
There were no tools identified in the literature that screened specifically for substance use in a gambling treatment setting. There were 11 gambling screening tools that had been validated in substance use treatment settings, including in mental health treatment settings where substance use affects a significant proportion of service users (de Castella, 2011; Himelhoch et al., 2015; Maarefvand et al., 2019; Nelson and Oehlert, 2008; Petry, 2003; Rowe et al., 2015; Sullivan, 2007; Volberg et al., 2011; and Wickwire et al., 2008). Four broad spectrum or multi-diagnostic screening tools were identified. These tools screened for both substance use and gambling in either a treatment setting (Christo et al., 2003; and Denis et al., 2016) or in the general population (MacLaren & Best, 2010; and Schluter et al., 2018). The remaining 4 tools screened for risk factors across a diverse range of health concerns including substance use and gambling in a primary health setting (Goodyear-Smith et al., 2004, 2009, 2013, 2021; and Elley et al.,. 2014) or for underlying behavioral traits in the general population (Chamberlain & Grant, 2018; Guo et al., 2017; and Rockloff and Dyer, 2006). These might be considered predictive tools rather than strictly screening.
Therapeutic Intervention
Four broad typologies of therapeutic intervention for co-occurring gambling and substance use harms were identified in the literature (see Table 3): psychosocial intervention; pharmacological plus psychosocial intervention; on-referral to appropriate service; and non-invasive neurological intervention.
Across 6 papers, 11 psychosocial interventions were identified (Cavicchioli et al., 2020; Chan et al., 2018; Kim & Hodgins, 2018; Petry et al., 2016; Rowe et al., 2015; and Toneatto et al., 2002). These papers looked at:
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interventions for gambling in substance use treatment seeking populations (n = 3);
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interventions for alcohol harms and gambling harms (not necessarily co-occurring) amongst a range of other behaviors (n = 1);
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the impact of substance use on gambling treatment outcomes (n = 1);
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the development of a working model for treatment, including treatment of co-occurring harms (n = 1).
One paper (Cavicchioli et al., 2020) comprised secondary analysis of an earlier study that had showed significant and moderate to large improvements in consecutive days of abstinence (CDA), severity of alcohol use disorder (AUD), severity of co-occurring substance use disorder (CO-SUD) and reduced difficulties in emotional regulation (DER) with dialectical behavioral therapy combined with skills training (DBT-ST). Other studies failed to measure substance use harms.
Despite not being validated, the component model of addiction (CMAT) has been included in the study, as it is the only tool that focuses on addressing vulnerability markers that appear to be common across gambling and substance use (Kim & Hodgins, 2018). It is a potential model of care that can inform the particular psychosocial interventions to be used in combination to address vulnerabilities.
In the 3 studies of pharmacological (opioid agonist) plus psychosocial interventions in co-occurring substance use and gambling harms, improvements were identified across measures including gambling and substance use across time (Alho et al., 2022; Toneatto et al., 2009; and Lahti et al., 2010). However, there was no statistically significant difference in improvements between groups administered active pharmacological plus psychosocial intervention and those administered placebo plus psychosocial intervention.
Only 1 study looked at on-referral (de Castella et al., 2011). In this study, those identified through screening as experiencing gambling harms (n = 50) were referred to a specialist gambling support service that provided individual counselling. They were also provided with information about self-exclusion and self-help groups. Only 15 of the 50 individuals identified for referral completed the follow-up interviews. Of these, 13 indicated that they had changed their gambling behavior, 8 had engaged in individual counselling (7 through the referral pathway) and 9 had attended a self-help group. Outcomes were measured at 6 months, with reduced severity scores across alcoholism (Brief MAST), anxiety (BAI), depression (BDI), gambling (MAGS), impulsivity (BIS-11), substance use (DAST), and suicide intent (SIS), and increased overall quality of life scores (FPQOLI). The reduction in gambling scores was not statistically significant and the median scores of gambling still placed participants within the Massachusetts gambling screen (MAGS) pathological gambling category. These results may be attributable to the small sample size. However, it is not unreasonable to conclude that the 35 individuals who were lost to follow up did not experience substantial reductions in gambling harm.
The literature identified 2 forms of non-invasive neurological intervention that have been validated in the context of co-occurring substance use and gambling harms (Gay et al., 2017; and Martinotti et al., 2019). Both of these studies found a statistically significant reduction in cue-induced craving on the visual analog scale (VAS). However, other measures of gambling behavior were either unaccounted for or showed no significant difference. Both studies had small sample sizes and measured only short-term effects.
Discussion
Identifying individuals experiencing, or at risk of experiencing, gambling harms at an early stage has the potential to reduce harms. Screening for gambling harms takes on greater urgency where there are low levels of help-seeking behavior (Cunningham, 2005). Help-seeking, when it occurs, is typically crisis driven and in the context of severe harms such as bankruptcy, criminal behavior, or relationship breakdown (Evans & Delfabbro, 2005). The substance use treatment setting is ideally placed to provide screening for gambling (Himelhoch et al., 2015). Those self-selecting to attend an alcohol and other drug service already demonstrate motivation to change and so may be more amenable to additional interventions. While the rate of help-seeking amongst those experiencing substance use harms is still low, it is higher than the estimated 1 in 10 who seek treatment for the gambling harms they experience (Matheson et al., 2019; and Dschaak and Juntunen, 2018).
There is a wide range of screening tools available for identifying gambling harms in individuals seeking treatment for substance use harms. Across the dataset 11 gambling screening tools were identified that have been validated in substance use treatment-seeking populations. With the exception of the 17-item NODS and the 27-item GDSQ-P, these are short (9 items or less) and can easily be included as part of a broader intake process. Five gambling screening tools comprise 4 item or fewer and have been developed to rapidly assess gambling harms. Brief screening can take a clinician less than 2 min to complete and requires little interpretive skill (Himelhoch et al., 2015). Services might select an appropriate screening tool based on a balance of brevity, client and clinician acceptability, sensitivity and specificity. Screening can flag the need for further clinical assessment before development of a treatment or referral plan.
A search of the literature failed to identify any screening tools for substance use validated in a gambling harm treatment-seeking population. This suggests a gap in the research that may, in part, reflect the relative lack of available treatment and support services for gambling. Broad spectrum or multi-diagnostic tools that screen for a range of so-called addictive behaviors may prove helpful for assessing co-occurring substance use and gambling harms where an individual does not have a primary presentation of substance use harm but may be less useful in populations in which gambling or substance use harms are already established. There are a wide range of substance use screening tools that have been validated in the general population. Some of the most widely used tools include the Alcohol, Smoking and Substance Involvement Screening Test (ASSIST); the Alcohol Use Disorders Identification Test (AUDIT); Cut down, Annoyed, Guilty and Eye-opener (CAGE); and Drug Use Disorders Identification Test (DUDIT). These screening tools have not been included in this study as there were no papers identified in the dataset on validation of substance use screening tools in a gambling treatment setting. This does not imply that such tools would be unsuitable for use in the gambling treatment context, but it does suggest the need for additional research.
The literature identified four broad spectrum or multi-diagnostic tools that may be useful in screening for both gambling and substance use. Given time and resource demands, many services have limited capacity to undertake lengthy screening (Dowling et al., 2019). The length of multi-diagnostic screening tools may make them prohibitive in a clinical setting. However, in some cases this may be offset by the capacity to undertake one extensive screen as opposed to multiple brief screens.
Transdiagnostic tools that assess risk or identify underlying behavioral traits may have limited utility in a treatment setting, where risk is already established and where individuals may, on average, be expected to score highly on measures of traits such as impulsivity, regardless of whether or not they are experiencing co-occurring harms. In some cases, however, identifying behavioral patterns or traits can help to target interventions to individuals. If an individual is high on traits this may signal increased likelihood of them experiencing not only substance use and gambling but also other related co-morbidities. Further research on the validity of these tools in a clinical setting or in a treatment seeking population is needed to assess their utility in screening for co-occurring gambling and substance use harms.
There are a number of considerations that may apply when choosing the most appropriate screening tool for co-occurring harms. These include but are not necessarily limited to the treatment setting; the presence or otherwise of a primary diagnosis of substance use disorder or gambling disorder; the expertise of staff in undertaking and interpreting screening; the time available in a clinical setting; and the willingness and capacity of service users to engage with a potentially lengthy screening process. The options for gambling screening tools in a substance use setting are well-covered in the literature. At present, screening for co-occurring substance use and gambling in a non-substance use setting is limited to broad spectrum or multi-diagnostic tools. Validation of existing substance use screening tools in a gambling treatment setting is needed.
There is an established evidence base for a range of therapeutic interventions for substance use harms, including psychosocial interventions (Manuel et al., 2011), pharmacological interventions (O’Connor & Fiellin, 2000; and Amato et al., 2005), and non-invasive neurological interventions (Lupi et al., 2017). There is a similar, growing evidence base for the treatment of gambling harms (Toneatto & Millar, 2004). However, relatively few studies have looked at treatment options for co-occurring substance use and gambling harms. This study identified only 13 papers that had looked at the efficacy of therapeutic interventions for those experiencing such co-occurring harms, including one study that examines a model of care—the CMAT—that has not yet been integrated into practice (Kim & Hodgins, 2018).
There is evidence in the literature for the use of dialectical behavioral therapy (DBT) modified with the addition of skills training (ST) to reduce the severity of gambling in individuals seeking treatment for substance use. Combined cognitive behavioral therapy (CBT) and motivational enhancement therapy (MET) were found to reduce days gambled, dollars gambled and SOGS scores in individuals seeking treatment for substance use, with results sustained to 24 months. Both of these treatment modalities require a high level of sustained engagement from a population that is known to have poor treatment engagement and high rates of early treatment cessation (Abbott et al., 2017). Brief advice can be efficacious in achieving rapid declines.
Treatment outcomes for psychosocial interventions across co-occurring harms (i.e. outcomes for both substance use and gambling) are not well-recorded in the literature. A study of the pilot RESTART program, which utilises a form of acceptance and commitment therapy (ACT), offered some cautiously optimistic results to two months. However, the program specifically excluded those experiencing substance use harms, with the exception of tobacco and alcohol. Furthermore, results were not broken down by harms experienced, making it difficult to assess outcomes for the population of interest to this study. The study by Toneatto et al. found improvements in gambling measures sustained to 12 months, along with a reduction in illicit drug use at post-treatment and no reduction in alcohol use. Harm is not distinguished from use in this study and the combining of treatment modalities for the purpose of analysis means no conclusions about the efficacy of a specific treatment type can be drawn.
Studies of opioid agonist treatment (naloxone or naltrexone) combined with psychosocial interventions showed some improvements on gambling and substance use measures over time. However, studies that controlled between active opioid agonist treatment plus psychosocial intervention and placebo plus psychosocial intervention did not discern a statistically significant difference between outcomes. This suggests that psychosocial interventions may have been the critical factor in treatment outcomes. Opioid agonists may be appropriate in some treatment contexts but will be counter-indicated in others. For example, opioid agonists will precipitate withdrawal in patients using opiates including buprenorphine and methadone (Aboujaoude & Salame, 2016).
Based on a single study there is inadequate evidence to support on-referral at this time. However future studies could examine different referral and follow up protocols. On referral that involves close collaboration between ATOD and gambling support service providers is an area that could benefit from further research to understand treatment outcomes across both substance use and gambling measures.
While neurological interventions (rTMS and tDCS) showed some results on cue-induced craving (VAS) measures, there was no evidence of improvements across other gambling or substance use measures. The available studies had small sample sizes and measured only shortterm outcomes. Further research is required to illuminate any benefits of non-invasive neurological interventions for a broader population of those experiencing co-occurring gambling and substance use harms. Research might also consider the efficacy of rTMS or tDCS combined with longer term psychosocial interventions to achieve sustained outcomes across measures of gambling and substance use. At the same time, it should be recognized that there is low likelihood of rTMS and/or tDCS being easily integrated into current substance-use treatment settings.
Conclusions
Developing best practice approaches to co-occurring gambling harms and substance use harms is an ongoing project that will need to adapt to an emerging body of evidence. This research has identified a range of potentially useful validated tools for clinicians in substance use treatment settings to screen for gambling harms. For workers in gambling treatment settings who are seeking validated tools to screen for co-occurring substance use harms, the literature provides less guidance. Substance use screening tools are widely available but have not been validated in a gambling treatment setting. Across both sectors and for clinicians in other healthcare settings (such as mental health or primary care) there are broad spectrum tools that can identify both gambling and substance use or identify underlying behavioral traits. However, these have various drawbacks including length, complexity and, in some cases, an inability to distinguish between different forms of harm.
The validated toolbox of therapeutic interventions for those experiencing co-occurring substance use and gambling harms is relatively sparse. Psychosocial interventions appear to offer the best outcomes on gambling measures for those experiencing co-occurring substance use harms. Further research is needed to establish the benefits of different combinations of treatment and treatment types in achieving reductions across both substance use and gambling harms, when these harms are experienced concurrently.
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Yarbakhsh, E., van der Sterren, A. & Bowles, D. Screening and Treatment for Co-occurring Gambling and Substance Use: A Scoping Review. J Gambl Stud 39, 1699–1721 (2023). https://doi.org/10.1007/s10899-023-10240-z
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DOI: https://doi.org/10.1007/s10899-023-10240-z