By Professor Wayne Denis Hall

Journal articles

Wilson J; Sunderland M; O'Dean S; Slade T; Dawson D; Dobson O; Leung J; Chan G; Teesson M; Hall W; Newton N; Lorenzetti V; Stockings E, 2026, 'Confusing Uncertainty With Bias: The Challenges of Working With Real-World Data', Drug and Alcohol Review, 45, http://dx.doi.org/10.1111/dar.70242

Leung J; Chan GCK; Zhang R; Hall WD; McClure-Thomas C, 2026, 'Sociodemographic Trends in Daily, Weekly and Less Than Weekly Cannabis Use in Australia', Drug and Alcohol Review, 45, http://dx.doi.org/10.1111/dar.70207

Hall WD; Dawson D; Johnson B; Yimer TM, 2026, 'The evolution of Australian cannabis policies, 1967 to 2024', Addiction, 121, pp. 2561 - 2572, http://dx.doi.org/10.1111/add.70414

Graham M; Ge Y; Pacula RL; Pessar SC; Wilkins C; Hall W; Hammond D, 2026, 'A cross-national comparison of nonmedical and medical use of psychedelic drugs in the international cannabis policy study', International Journal of Drug Policy, 154, http://dx.doi.org/10.1016/j.drugpo.2026.105348

Fischer B; Hall W, 2026, 'Comments on DG-Sucht et al. (2026): Evaluation of the Consumer Cannabis Act: Preliminary data do not allow an all-clear, and on the reply by Manthey et al. (2026): When will it be possible to make reliable statements about the effects of the partial legalization of cannabis?', Sucht, 72, pp. 233 - 234, http://dx.doi.org/10.1024/0939-5911/a000994

Wilson J; Dobson O; Langcake A; Mishra P; Bryant Z; Leung J; Dawson D; Graham M; Teesson M; Freeman TP; Hall W; Chan GCK; Stockings E, 2026, 'Efficacy and safety of cannabinoids – Authors’ reply', Lancet Psychiatry, 13, pp. 642 - 643, http://dx.doi.org/10.1016/S2215-0366(26)00198-7

Vu GT; Sun T; Connor JP; Thai P; Gartner C; Hall W; Leung J; Chan G, 2026, 'Patterns and Correlates of Disposable E-Cigarette Use Among U.S. Youth', American Journal of Preventive Medicine, 71, http://dx.doi.org/10.1016/j.amepre.2026.108352

Fischer B; Hall W, 2026, 'Recent decreases in drug overdose deaths: Assessing evidence for supply-related drivers and implications for health-oriented drug policy in Canada', Preventive Medicine, 209, http://dx.doi.org/10.1016/j.ypmed.2026.108607

Bade R; Nadarajan D; Harris K; Harvey C; Jiranantakan T; Morgan H; Partridge E; Schumann J; Smith JL; Weber C; Hall W, 2026, 'Complementary insights from wastewater surveillance and the toxicology findings of clinical presentations involving new psychoactive substances in Australia', Journal of Analytical Toxicology, 50, http://dx.doi.org/10.1093/jat/bkag071

Freeman TP; Thorne RL; Wadsworth E; Carney T; Castillo-Carniglia A; Cerdá M; Kalayasiri R; Kilmer B; Lorenzetti V; Manthey J; Myran DT; Rivera-Aguirre A; Rychert M; Wilson J; Yimer T; Hall W, 2026, 'International cannabis policies and their association with cannabis use, cannabis use disorder, and other psychiatric disorders', Lancet Psychiatry, 13, pp. 615 - 626, http://dx.doi.org/10.1016/S2215-0366(26)00087-8

Hall W; Yimer TM; Thorne RL; Hoch E; Burke C; Gridley A; Hurd YL; Wilson J; Leung J; Freeman TP, 2026, 'Relationships between cannabis use and mental disorders: assessing the coherence of evidence from studies with different methodologies', Lancet Psychiatry, 13, pp. 604 - 614, http://dx.doi.org/10.1016/S2215-0366(26)00086-6

Ngo HKT; Thai PK; Connor JP; Loveday B; Verhagen R; Bade R; O’Brien JW; Gerber C; Keller E; Simpson BS; Culshaw P; Hall W; Humphreys K; Thomas KV; Mueller JF; Tscharke B, 2026, 'Trends of Fentanyl and Oxycodone Use in Australia (2018–2022) in National Prescription and Wastewater Data Sets', Environmental Science and Technology, 60, pp. 17615 - 17626, http://dx.doi.org/10.1021/acs.est.5c18126

McClure-Thomas C; Yimer T; Strong C; Sun T; Hall WD; Chan GCK; Connor JP; Leung J, 2026, 'A systematic review and meta-analysis of self-reported exposure to cannabis advertising and its association with cannabis use and intentions', Addiction, 121, pp. 1343 - 1361, http://dx.doi.org/10.1111/add.70310

Dawson D; Stjepanović D; Leung J; Lim C; Hall W; Lorenzetti V; Chan G; Hammond D, 2026, 'Self-reported reasons for medical and nonmedical cannabis use in Australia: A cross-sectional analysis of the International Cannabis Policy Study 2023', Drug and Alcohol Dependence, 283, http://dx.doi.org/10.1016/j.drugalcdep.2026.113124

Fischer B; Hall W; Jutras-Aswad D; Le Foll B; Myran DT, 2026, 'Cannabis Legalization Outcomes in Canada: Trading Off Increased Health Problem for Reduced Crime Burdens Is Not Good Enough', CANADIAN JOURNAL OF PSYCHIATRY-REVUE CANADIENNE DE PSYCHIATRIE, http://dx.doi.org/10.1177/07067437261454772

Lim CCW; Sun T; Lai G; Hall W; Connor J; Lee YY; Cho A, 2026, 'Patterns, reasons and characteristics of e-cigarette use in Australia: Findings from the 2022–2023 National Drug Strategy Household Survey', Addiction, 121, pp. 1100 - 1109, http://dx.doi.org/10.1111/add.70281

Verhagen R; Gerber C; Thai P; Bade R; O'Brien J; Keller EL; Simpson BS; Hall W; Leung J; Thomas KV; Mueller JF; Tscharke BJ, 2026, 'Cannabis consumption in Australia 2018–2025: Socio-economic and regional trends from wastewater and survey data', Addiction, 121, pp. 861 - 869, http://dx.doi.org/10.1111/add.70277

Tscharke B; Livingston M; Clifford S; Zheng Q; Thai PK; Verhagen R; Bade R; O'Brien JW; Gerber C; Keller E; Simpson BS; Thomas KV; Hall W; Mueller JF, 2026, 'Changes in wastewater measures of alcohol consumption in Alice Springs, Australia, 1 year after the introduction of restrictions on alcohol sales', Addiction, 121, pp. 851 - 860, http://dx.doi.org/10.1111/add.70262

Hall W; Yeates S, 2026, 'Correcting popular misconceptions about the origins of the Marihuana Tax Act of 1937', Addiction, 121, pp. 1008 - 1018, http://dx.doi.org/10.1111/add.70280

Wilson J; Dobson O; Langcake A; Mishra P; Bryant Z; Leung J; Dawson D; Graham M; Teesson M; Freeman TP; Hall W; Chan GCK; Stockings E, 2026, 'The efficacy and safety of cannabinoids for the treatment of mental disorders and substance use disorders: a systematic review and meta-analysis', Lancet Psychiatry, 13, pp. 304 - 315, http://dx.doi.org/10.1016/S2215-0366(26)00015-5

Fischer B; Hall W; Le Foll B; Conrod P, 2026, '‘Strategic approaches to reducing the substance use-related burden of disease in Canada’ — authors' reply', Lancet Regional Health Americas, 55, http://dx.doi.org/10.1016/j.lana.2026.101376

Chung J; Stjepanović D; Cheng B; Lim CCW; Hall W; Connor JP; Chan GCK, 2026, 'Cannabis vaping and mental health: The association of Δ-9-tetrahydrocannabinol and cannabidiol with anxiety and depressive symptoms—Findings from the United States National Youth Tobacco Survey (2021–2023)', Addiction, 121, pp. 617 - 628, http://dx.doi.org/10.1111/add.70218

Chung J; Lim CCW; Leung J; Stjepanovic D; Chiu V; Hides L; Connor JP; Hall W; Chan GCK, 2026, 'Cannabis Vaping in Youth: A Systematic Review and MetaAnalysis of Risk Factors in Adolescents and Young Adults', Journal of Studies on Alcohol and Drugs, 87, pp. 249 - 273, http://dx.doi.org/10.15288/jsad.24-00464

Dawson D; Lim C; Leung J; Lorenzetti V; Gray A; Hall W; Stjepanović D, 2026, 'Doubtful medical cannabis prescribing practices identified from 55 medical cannabis websites', Australian and New Zealand Journal of Psychiatry, 60, pp. 194 - 196, http://dx.doi.org/10.1177/00048674251396013

Hall W; Fischer B, 2026, 'Public health impacts of legalizing recreational cannabis use in Canada and the US', World Psychiatry, 25, pp. 53 - 54, http://dx.doi.org/10.1002/wps.70030

Thai PK; Zheng Q; Yagishita N; Wang Z; Hara-Yamamura H; Hall W; Honda R, 2026, 'Using wastewater analysis to estimate the prevalence of THC and CBD use in a population of Japan during and after the Covid-19 pandemic (2020–2023)', Forensic Science International, 378, http://dx.doi.org/10.1016/j.forsciint.2025.112687

Fischer B; Corace K; Hall W; Jutras-Aswad D; Le Foll B, 2026, '‘Involuntary treatment’ for severe substance use disorders (SUDs). An overview of key issues, experiences and outcomes for consideration in policy development in Canada', Drugs Education Prevention and Policy, 33, pp. 262 - 276, http://dx.doi.org/10.1080/09687637.2025.2566011

Kalayasiri R; Ratta-apha W; Wilson J; Hall W; Freeman TP, 2026, 'Can Thailand replace a commercialised cannabis market for adult use with a medical prescription model?', Addiction, http://dx.doi.org/10.1111/add.70499

Sun T; Chan GCK; Stjepanović D; Yimer T; Vu GT; Lim C; McClure-Thomas C; Russel C; Connor J; Hall W; Hides L; Hammond D; Dietrich T; Erku D; Johnson B; Leung J, 2026, 'Co-Designing AI-Generated Vaping Awareness Materials With Adolescents and Young Adults: A Qualitative Study', Drug and Alcohol Review, 45, http://dx.doi.org/10.1111/dar.70022

Fischer B; Robinson T; Bullen C; Curran V; Jutras-Aswad D; Medina-Mora ME; Pacula R; Rehm J; Room R; van den Brink W; Hall W, 2026, 'Die ‘Richtlinien für die Risiko-Reduzierung beim Cannabiskonsum (RRRCK)’: EMPFEHLUNGEN: [The ‘Lower-Risk Cannabis Use Guidelines (LRCUG)’: RECOMMENDATIONS (GERMAN)]', International Journal of Drug Policy, 147, http://dx.doi.org/10.1016/j.drugpo.2023.103995

Dawson D; Hall W; Goodwin I; Carlini BH; Lubman DI; Hammond D; Freeman TP; Lorenzetti V, 2026, 'Exploring THC labelling preferences to communicate the strength of cannabis products: Insights from U.S. consumers', International Journal of Drug Policy, 147, http://dx.doi.org/10.1016/j.drugpo.2025.105076

Borland R; Martin J; Jegasothy E; Youdan B; Hall W, 2026, 'Has Australia lost control of its tobacco and nicotine markets?', Addiction, http://dx.doi.org/10.1111/add.70428

Fischer B; Robinson T; Bullen C; Curran V; Jutras-Aswad D; Medina-Mora ME; Pacula R; Rehm J; Room R; van den Brink W; Hall W, 2026, 'Las ‘Guías para el Uso de Cannabis de Menor Riesgo (GUCMR)’: RECOMENDACIONES [The ‘Lower-Risk Cannabis Use Guidelines (LRCUG)’: RECOMMENDATIONS (SPANISH)]', International Journal of Drug Policy, 147, http://dx.doi.org/10.1016/j.drugpo.2023.103996

Fischer B; Robinson T; Bullen C; Curran V; Jutras-Aswad D; Medina-Mora ME; Pacula R; Rehm J; Room R; van den Brink W; Hall W, 2026, 'Les ‘Lignes Directrices Pour l'Usage du Cannabis à Moindre Risque (LUCMR)’: RECOMMENDATIONS [The ‘Lower-Risk Cannabis Use Guidelines (LRCUG)’: RECOMMENDATIONS (FRENCH)]', International Journal of Drug Policy, 147, http://dx.doi.org/10.1016/j.drugpo.2023.103994

Dawson D; Stjepanović D; McClure-Thomas C; Lorenzetti V; Hall W; Sun T; Leung J, 2026, 'Motivations and Pathways: A Thematic Analysis of Interviews with Medicinal Cannabis Consumers in Australia', Substance Use and Misuse, 61, pp. 638 - 642, http://dx.doi.org/10.1080/10826084.2025.2560074

Wang Z; Zheng Q; Thai PK; Gartner C; O’Brien JW; Bade R; Verhagen R; Hall W; Stjepanović D; Simpson BS; Keller EL; Thomas KV; Mueller JF; Tscharke B, 2026, 'National Wastewater Surveillance of Illicit Tobacco and Vaping Use Trends in Australia', JAMA Network Open, 9, http://dx.doi.org/10.1001/jamanetworkopen.2025.57319

Leung J; Stjepanović D; Chan GCK; Hall WD; Dawson D, 2026, 'Proportions and correlates of high-risk cannabis use in Australia—A cross-sectional analysis of the 2022–2023 National Drug Strategy Household Survey', Addiction, http://dx.doi.org/10.1111/add.70383

Fischer B; Hall W; Le Foll B; Conrod P, 2026, 'Strategic approaches to reducing the substance use-related burden of disease in Canada', Lancet Regional Health Americas, 53, http://dx.doi.org/10.1016/j.lana.2025.101289

Johnson B; Parker S; Xu R; Simmons R; Hall W, 2026, 'The challenge of improving assessment and treatment for attention-deficit/hyperactivity disorder in Australia', Australian and New Zealand Journal of Psychiatry, http://dx.doi.org/10.1177/00048674261465180

Leung J; Stjepanovic D; Fong S; Dawson D; Vu G; Yimer T; McClure-Thomas C; Hall WD; Chan GCK, 2026, 'The psychometric properties of validated tools to assess cannabis use disorder: A systematic review and meta-analysis', Addiction, http://dx.doi.org/10.1111/add.70438

Hall W; Fischer B, 2026, 'Explaining an abrupt, substantial reduction in US opioid overdose deaths', International Journal of Drug Policy, pp. 105301, http://dx.doi.org/10.1016/j.drugpo.2026.105301

Clay S; Hall W, 2026, 'Out of Sight, Out of Mind: Shedding Light on Two Blind Spots in Harm Reduction Discourse.', Drug Alcohol Rev, 45, pp. e70259, http://dx.doi.org/10.1111/dar.70259

Chung J; Lim CCW; Stjepanović D; Hall W; Connor JP; Chan GCK, 2025, 'Adolescent Cannabis Vaping Trends (2021–2023): Delta-9-Tetrahydrocannabinol, Cannabidiol, and Synthetic Cannabinoids', American Journal of Preventive Medicine, 69, http://dx.doi.org/10.1016/j.amepre.2025.107655

Hall W; Ramaekers JG, 2025, 'Challenges in Responding to Cannabis-Impaired Motor Vehicle Drivers', Clinical Chemistry, 71, pp. 1181 - 1183, http://dx.doi.org/10.1093/clinchem/hvaf126

Gaudreault A; Gibb M; Talarico R; Fischerf B; Hall W; Myran DT, 2025, 'Impact of the first year of British Columbia’s decriminalization of drug possession for personal use on drug crime in Canada', International Journal of Drug Policy, 146, http://dx.doi.org/10.1016/j.drugpo.2025.105042

Kang H; Steadman KJ; Hoek J; Hall WD; Gartner CE, 2025, 'Restricting supply of tobacco products to pharmacies: a scoping review', Tobacco Control, 34, pp. e80 - e87, http://dx.doi.org/10.1136/tc-2023-058486

Vu GT; Sun T; Hall W; Connor JP; Thai P; Gartner C; Leung J; Chan G, 2025, 'Trends in Social Norms Toward Cigarette Smoking and E-cigarette Use Among U.S. Youth Between 2015 and 2021', Nicotine and Tobacco Research, 27, pp. 2168 - 2176, http://dx.doi.org/10.1093/ntr/ntaf120

Hue TTT; Ngo HKT; Wang Z; Anh NTK; Binh VN; Trung NQ; Chinh PQ; Luong HT; Zheng Q; Hall W; Thai PK, 2025, 'Significant changes in preference of illicit drug use in a population of Hanoi, Vietnam—A 6-year wastewater study (2018–2023)', Addiction, 120, pp. 2295 - 2304, http://dx.doi.org/10.1111/add.70147

Kerr JA; Husin HM; Leung J; Dashti SG; Degenhardt L; Ellul S; Spry EA; Sawyer SM; Campbell G; Hall WD; Yimer TM; Chan GCK; Patton GC; Olsson CA, 2025, 'The natural history of DSM-5 alcohol-use disorder from late adolescence to middle adulthood in Australia: a prospective cohort study', Lancet Public Health, 10, pp. e923 - e932, http://dx.doi.org/10.1016/S2468-2667(25)00225-7

Hall W; Yeates S, 2025, 'Isaac Campos. Home grown: Marijuana and the origins of Mexico's war on drugs', Addiction, 120, pp. 2147 - 2150, http://dx.doi.org/10.1111/add.70072

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