Research & sources

Every study we cite, in one place.

The research claims in our guides are grounded in published studies. Peer-reviewed studies where they exist, independent evaluations where they don't. This page lists all of it. None of these studies tested Lessen, and Lessen's clinical effectiveness has not been established.

Reduction, quitting, and goals

Slutske, W. S., Piasecki, T. M., Blaszczynski, A., & Martin, N. G. (2010). Pathological gambling recovery in the absence of abstinence. Addiction, 105(12), 2169–2175. Study · cited in Bet less without quitting

Ladouceur, R., Lachance, S., & Fournier, P. (2009). Is control a viable goal in the treatment of pathological gambling? Behaviour Research and Therapy, 47(3), 189–197. Study · cited in Bet less · Using Lessen well

Stea, J. N., Hodgins, D. C., & Fung, T. (2015). Abstinence versus moderation goals in brief motivational treatment for pathological gambling. Journal of Gambling Studies. cited in Using Lessen well

Locke, E. A., & Latham, G. P. Goal-setting theory (1990; 2002; 2019 review). cited in Using Lessen well

Harkin, B., et al. (2016). Does monitoring goal progress promote goal attainment? A meta-analysis. Psychological Bulletin, 142(2), 198–229. cited in How to stop

Matthews, G. (2007). The impact of commitment, accountability, and written goals on goal achievement. Dominican University of California. Conference paper. Workplace goals, not gambling; we flag it as such. cited in Using Lessen well

Patterns, timing, and risk markers

Auer, M., & Griffiths, M. D. (2023). First-week account data predicting future gambling intensity. cited in Why the urge repeats · What your history shows

Finkenwirth, S., et al. (2021). Using machine learning to predict self-exclusion status in online gamblers from account data. International Gambling Studies. cited in Why the urge repeats · What your history shows

Perrot, B., et al. (2018); Challet-Bouju, G., et al. (2020); Balem, M., et al. (2022). Account-based operationalizations of chasing in online gambling. cited in Why the urge repeats · First 24 hours

Problem gambling and insomnia: correlational evidence (2021). Study · cited in Why the urge repeats

Micro-event and in-play sports betting and problem gambling (2020). Study · cited in Why the urge repeats

Allami, Y., Hodgins, D. C., et al. A meta-analysis of problem gambling risk factors in the general adult population. Addiction. cited in How betting risk builds

Braverman, J., & Shaffer, H. J. (2012). How do gamblers start gambling: identifying behavioural markers for high-risk internet gambling. European Journal of Public Health. cited in How betting risk builds

Ferris, J., & Wynne, H. (2001). The Canadian Problem Gambling Index: Final report. Canadian Centre on Substance Abuse. The PGSI. The screener behind our assessment. cited in How betting risk builds · The assessment

Memory vs the record

Heirene, R. M., Wang, A., & Gainsbury, S. M. (2022). Accuracy of self-reported gambling frequency and outcomes: comparisons with account data. Psychology of Addictive Behaviors, 36(4), 333–346. Study · cited in Lessen vs BetBreaker · What your history shows

Braverman, J., Tom, M. A., & Shaffer, H. J. (2014). Accuracy of self-reported versus actual online gambling wins and losses. Psychological Assessment. Study · cited in Lessen vs BetBreaker · First 24 hours

Auer, M., & Griffiths, M. D. (2017). Self-reported losses versus actual losses in online gambling. Journal of Gambling Studies, 33(3), 795–806. Study · cited in Connected apps · What your history shows

Shaffer, H. J., Peller, A. J., LaPlante, D. A., Nelson, S. E., & LaBrie, R. A. (2010). Toward a paradigm shift in Internet gambling research: from opinion and self-report to actual behavior. Addiction Research & Theory, 18(3), 270–283. Study · cited in Connected apps

Auer, M., & Griffiths, M. D. (2015; 2016; 2020). Personalized behavioral feedback studies in online gambling. cited in What your history shows

Blocks and financial controls

GambleAware (2019). Evaluating online blocking software: findings report. Report · cited in Lessen vs Gamban · How to stop

University of Bristol for GambleAware (2020). A blueprint for bank card gambling blockers (MAGPIE review). cited in How to stop · First 24 hours · Using Lessen well

GamCare / Monzo (2024). Bank gambling-block outcomes data. cited in Using Lessen well

Slips, relapse, and how long change takes

Hodgins, D. C., & el-Guebaly, N. (2004). Retrospective and prospective reports of precipitants to relapse in pathological gambling. Journal of Consulting and Clinical Psychology, 72(1), 72–80. cited in How to stop · First 24 hours

Collins, S. E., & Witkiewitz, K. (2013). The abstinence violation effect, in the Marlatt & Gordon relapse-prevention tradition. cited in First 24 hours

Lally, P., et al. (2010). How are habits formed: modelling habit formation in the real world. European Journal of Social Psychology. cited in Using Lessen well

Support, layering, and treatment

Kantar for GamCare, Gamban & GAMSTOP (2026). TalkBanStop independent evaluation; Ipsos first-year evaluation (2022). cited in How to stop · Using Lessen well

Marionneau, V., et al. (2023). Gambling harm prevention and harm reduction in online environments: a call for action. Harm Reduction Journal. cited in Using Lessen well

Petry, N. M., & Weiss, L. (2009). Social support and gambling treatment outcomes. Study · cited in First 24 hours · Using Lessen well

Jiménez-Murcia, S., et al. (2017). The involvement of a concerned significant other in gambling disorder treatment outcome. Journal of Gambling Studies. cited in Using Lessen well

Matheson, F. I., et al. (2016). Gamblers Anonymous as a recovery pathway: a scoping review. Journal of Gambling Studies. Study · cited in Using Lessen well

BMC Psychiatry (2021). Non-pharmacological treatment of gambling disorder: a systematic review of randomized controlled trials. cited in Using Lessen well

Digital tools and engagement

Eysenbach, G. (2005). The law of attrition. Journal of Medical Internet Research. cited in Using Lessen well

Baumel, A., et al. (2019). Objective user engagement with mental health apps. Journal of Medical Internet Research. cited in Using Lessen well

Torous, J., et al. (2020). Dropout rates in clinical trials of smartphone apps for depressive symptoms. Journal of Affective Disorders. cited in Using Lessen well

Linardon, J., et al. (2026). Association between user engagement and clinical outcomes in smartphone apps for depression and anxiety. Psychiatry Research, 355:116864. cited in Using Lessen well

Predicting early dropout in a digital tobacco cessation intervention: replication and extension (2024). JMIR. cited in Using Lessen well

Baron, K. G., et al. (2017). Orthosomnia: sleep-tracking preoccupation. Journal of Clinical Sleep Medicine. cited in Using Lessen well

Nelson, R. O., & Hayes, S. C. Reactivity of self-monitoring (reviews). cited in Using Lessen well

Spot an error, a retraction, or a stronger study we should cite? Tell us. we'd rather fix the page than defend it.