Hudson Reddon, University of British Columbia

Research

Cannabis Access Cannabis Use Drug-Related Harm Gateway Effects Harm Reduction Legalization People Who Use Drugs Youth

Latest papers

Beyond mood: alcohol and substance use older adults with bipolar disorder.
Current opinion in psychiatry · 2026
Self-reported cannabis use to manage opioid withdrawal symptoms and reductions in opioid use among people who use unregulated opioids: a cross-sectional analysis.
Journal of cannabis research · 2026
Longitudinal polysubstance use patterns and non-fatal overdose: A repeated measures latent class analysis.
The International journal on drug policy · 2025

All 27 publications

Latest funding

Longitudinally evaluating the health impacts of cannabis regulation among two sentinel populations with high rates of cannabis use and drug-related harms
CIHR · 2022 · Principal investigator
$490,845
A mixed methods evaluation of safer supply initiatives to reduce illicit drug overdose in BC
CIHR · 2021 · Co-investigator
$2,050,200

All 2 grants and awards

27 publications.

01

Beyond mood: alcohol and substance use older adults with bipolar disorder.

de Siqueira Rotenberg L, Reddon H, Nunes PV

Current opinion in psychiatry2026

DOI: 10.1097/yco.0000000000001090 PMID: 42054082

02

Self-reported cannabis use to manage opioid withdrawal symptoms and reductions in opioid use among people who use unregulated opioids: a cross-sectional analysis.

McAdam E, Reddon H, Socías ME, Lake S, Hayashi K, DeBeck K, Walsh Z, Milloy MJ

Journal of cannabis research2026

DOI: 10.1186/s42238-026-00458-0 PMID: 42343486

03

Longitudinal polysubstance use patterns and non-fatal overdose: A repeated measures latent class analysis.

Karamouzian M, Cui Z, Hayashi K, DeBeck K, Reddon H, Buxton JA, Kerr T

The International journal on drug policy2025

DOI: 10.1016/j.drugpo.2023.104301 PMID: 38182524

04

Cannabis use and illicit opioid cessation among people who use drugs living with chronic pain.

Kitchen C, Socias E, Sayre EC, Hayashi K, DeBeck K, Milloy MJ, Kerr T, Reddon H

Drug and alcohol review2025Senior author

DOI: 10.1111/dar.14014 PMID: 40011075

05

Examining Safer Opioid Supply Policies.

Reddon H, Bach P, Milloy MJ

JAMA internal medicine2024First author

DOI: 10.1001/jamainternmed.2024.1217 PMID: 38709512

06

Prevalence and Correlates of Heavy Alcohol use among People Living with HIV who use Unregulated Drugs in Vancouver, Canada.

Hui J, Reddon H, Fairbairn N, Choi J, Milloy MJ, Socias ME

AIDS and behavior2024

DOI: 10.1007/s10461-024-04341-y PMID: 38662276

07

COVID-19 vaccination among young people who use drugs in Vancouver, Canada.

McAdam E, Hayashi K, Barker B, Reddon H, Choi J, Kerr T, DeBeck K

Vaccine2024

DOI: 10.1016/j.vaccine.2024.01.003 PMID: 38225183

08

Stigma-related barriers to medical cannabis as harm reduction for substance use disorder: Obstacles and opportunities for improvement.

Fehr F, Lo LA, Nelson C, Nanson K, Diehl L, Nielson K, Reddon H, Walsh Z

International journal of mental health nursing2024

DOI: 10.1111/inm.13231 PMID: 37767954

09

Cannabis use to manage stimulant cravings among people who use unregulated drugs.

Reddon H, Socias ME, DeBeck K, Hayashi K, Walsh Z, Milloy MJ

Addictive behaviors2024First author

DOI: 10.1016/j.addbeh.2023.107867 PMID: 37748225

10

Uptake of SARS-CoV-2 vaccination among structurally-marginalized people who use drugs in Vancouver, Canada.

Reddon H, Barker B, Bartlett S, Márquez AC, Sekirov I, Jassem A, Morshed M, Clemens A, Beck McGreevy P, Hayashi K, DeBeck K, Krajden M, Milloy MJ, Socías ME

Scientific reports2023First author

DOI: 10.1038/s41598-023-44069-8 PMID: 37863999

Longitudinally evaluating the health impacts of cannabis regulation among two sentinel populations with high rates of cannabis use and drug-related harms

Principal investigatorCIHR2022Op. Gr.:Cannabis Res. in Longit. studies-Neurosciences, Ment. health/Addiction

Principal investigators: Milloy, Michael-John S; Reddon, Hudson; Walsh, Zach

Keywords: Cannabis Access; Cannabis Use; Drug-Related Harm; Gateway Effects; Harm Reduction; Legalization; People Who Use Drugs; Youth

$490,845

A mixed methods evaluation of safer supply initiatives to reduce illicit drug overdose in BC

Co-investigatorCIHR2021Project Grant

Principal investigators: Urbanoski, Karen A; Barker, Brittany M; Nosyk, Bohdan P; Pauly, Bernadette M; Slaunwhite, Amanda K

Keywords: Epidemiology; Harm Reduction; Health Policy; Indigenous Health; Mixed Methods; Overdose; Safer Supply; Substance Use

$2,050,200

From CIHR, NSERC and SSHRC funding decisions: CIHR since 2008, NSERC since 1991 and SSHRC since 1998, including their latest published competition results.

Frequent collaborators

Kanna Hayashi and Kanna Hayashi: 196 shared papers
Thomas Kerr and Evan Wood: 190 shared papers
Thomas Kerr and Kanna Hayashi: 167 shared papers
Evan Wood and Kanna Hayashi: 117 shared papers
Thomas Kerr and Kanna Hayashi: 106 shared papers
Thomas Kerr and Kora DeBeck: 91 shared papers
Kora DeBeck and Kanna Hayashi: 90 shared papers
Kora DeBeck and Kanna Hayashi: 85 shared papers
Julio Montaner and Evan Wood: 82 shared papers
Thomas Kerr and Julio Montaner: 52 shared papers
Kanna Hayashi and Nadia Fairbairn: 39 shared papers
Evan Wood and Nadia Fairbairn: 36 shared papers
Evan Wood and Seonaid Nolan: 29 shared papers
Nadia Fairbairn and Seonaid Nolan: 28 shared papers
Julio Montaner and Kanna Hayashi: 21 shared papers
Evan Wood and Keith Ahamad: 21 shared papers
Kanna Hayashi and Seonaid Nolan: 18 shared papers
Mel Krajden and Agatha Jassem: 17 shared papers
Kanna Hayashi and Paxton Bach: 17 shared papers
Mel Krajden and Sofia Bartlett: 15 shared papers
Mel Krajden and Inna Sekirov: 15 shared papers
Evan Wood and Paxton Bach: 15 shared papers
Kanna Hayashi and Paxton Bach: 14 shared papers
Thomas Kerr and Mohammad Karamouzian: 13 shared papers
Kora DeBeck and Hudson Reddon: 11 shared papers
Kanna Hayashi and Hudson Reddon: 11 shared papers
Kanna Hayashi and Hudson Reddon: 11 shared papers
Julio Montaner and Rolando Barrios: 10 shared papers
Julio Montaner and Robert Hogg: 10 shared papers
Thomas Kerr and Keith Ahamad: 9 shared papers
Thomas Kerr and Hudson Reddon: 9 shared papers
Rolando Barrios and Robert Hogg: 9 shared papers
Keith Ahamad and Seonaid Nolan: 9 shared papers
Brittany Barker and Brittany Barker: 9 shared papers
Kanna Hayashi and Michael-John Milloy: 8 shared papers
Thomas Kerr and Rolando Barrios: 7 shared papers
Kora DeBeck and Danya Fast: 7 shared papers
Evan Wood and Michael-John Milloy: 7 shared papers
Kanna Hayashi and Mohammad Karamouzian: 7 shared papers
Thomas Kerr and Michael-John Milloy: 6 shared papers
Thomas Kerr and Mohammad Karamouzian: 6 shared papers
Evan Wood and Hudson Reddon: 6 shared papers
Evan Wood and Robert Hogg: 6 shared papers
Kanna Hayashi and Zach Walsh: 6 shared papers
Kanna Hayashi and Zach Walsh: 6 shared papers
Nadia Fairbairn and Hudson Reddon: 6 shared papers
Mohammad Karamouzian and Mohammad Karamouzian: 6 shared papers
Thomas Kerr and Zach Walsh: 5 shared papers
Kanna Hayashi and Mohammad Karamouzian: 5 shared papers
Thomas Kerr and Danya Fast: 4 shared papers
Evan Wood and Danya Fast: 4 shared papers
Zach Walsh and Hudson Reddon: 4 shared papers
Rolando Barrios and Hudson Reddon: 3 shared papers
Michael-John Milloy and Hudson Reddon: 3 shared papers
Seonaid Nolan and Hudson Reddon: 3 shared papers
Agatha Jassem and Inna Sekirov: 3 shared papers
Julio Montaner and Hudson Reddon: 2 shared papers
Paxton Bach and Brittany Barker: 2 shared papers
Paxton Bach and Brittany Barker: 2 shared papers
Mohammad Karamouzian and Hudson Reddon: 2 shared papers
Thomas Kerr and Brittany Barker: 1 shared paper
Thomas Kerr and Brittany Barker: 1 shared paper
Kora DeBeck and Sofia Bartlett: 1 shared paper
Kora DeBeck and Agatha Jassem: 1 shared paper
Kora DeBeck and Inna Sekirov: 1 shared paper
Mel Krajden and Hudson Reddon: 1 shared paper
Rolando Barrios and Sofia Bartlett: 1 shared paper
Danya Fast and Hudson Reddon: 1 shared paper
Keith Ahamad and Hudson Reddon: 1 shared paper
Paxton Bach and Hudson Reddon: 1 shared paper
Brittany Barker and Hudson Reddon: 1 shared paper
Hudson Reddon and Mohammad Karamouzian: 1 shared paper
Hudson Reddon and Sofia Bartlett: 1 shared paper
Hudson Reddon and Agatha Jassem: 1 shared paper
Hudson Reddon and Brittany Barker: 1 shared paper
Hudson Reddon and Robert Hogg: 1 shared paper
Hudson Reddon and Inna Sekirov: 1 shared paper

Medicine
Social Medicine
Canadian Institute for Substance Use Research
School of Population and Public Health
Family Practice
Laboratory Medicine and Pathology
Social & Behavioural Health Sciences Division
Other

Co-authors at University of British Columbia, colored by department. Thicker lines mean more shared papers; select anyone to open their profile and their own map.

Nadia Fairbairn

Social Medicine

6 shared papers, latest 2024

Evan Wood

Social Medicine

6 shared papers, latest 2021

Mohammad Karamouzian

Social & Behavioural Health Sciences Division

1 shared papers, latest 2025

Inna Sekirov

School of Population and Public Health

1 shared papers, latest 2023

Keith Ahamad

Family Practice

1 shared papers, latest 2018

Brittany Barker

Canadian Institute for Substance Use Research

1 shared papers, latest 2024

Mel Krajden

Laboratory Medicine and Pathology

1 shared papers, latest 2023

Write to this professor

A short, specific email works best. This draft uses one of their recent papers; replace the parts in brackets with your own details before sending.

Applying for

Paper to mentionMention their CIHR grant from 2022

Subject: Prospective PhD student: Cannabis Access Dear Professor Reddon, My name is [your name], and I am a [your current degree or role] at [your institution]. I am applying for a PhD position starting in [term and year]. I read your paper "Beyond mood: alcohol and substance use older adults with bipolar disorder." (2026), and it connects closely to my own work on [your research topic]. [One or two sentences on what you did and what you learned.] I also saw your CIHR-funded project "Longitudinally evaluating the health impacts of cannabis regulation among two sentinel populations with high rates of cannabis use and drug-related harms" (2022), and I would be glad to contribute to work in that direction. Are you accepting new PhD students for [term and year]? I have attached my CV and transcripts, and I would be glad to talk at a time that suits you. Thank you for your time. Kind regards, [your name]

Hudson Reddon

Research

Latest papers

Latest funding

Beyond mood: alcohol and substance use older adults with bipolar disorder.

Self-reported cannabis use to manage opioid withdrawal symptoms and reductions in opioid use among people who use unregulated opioids: a cross-sectional analysis.

Longitudinal polysubstance use patterns and non-fatal overdose: A repeated measures latent class analysis.

Cannabis use and illicit opioid cessation among people who use drugs living with chronic pain.

Examining Safer Opioid Supply Policies.

Prevalence and Correlates of Heavy Alcohol use among People Living with HIV who use Unregulated Drugs in Vancouver, Canada.

COVID-19 vaccination among young people who use drugs in Vancouver, Canada.

Stigma-related barriers to medical cannabis as harm reduction for substance use disorder: Obstacles and opportunities for improvement.

Cannabis use to manage stimulant cravings among people who use unregulated drugs.

Uptake of SARS-CoV-2 vaccination among structurally-marginalized people who use drugs in Vancouver, Canada.

Longitudinally evaluating the health impacts of cannabis regulation among two sentinel populations with high rates of cannabis use and drug-related harms

A mixed methods evaluation of safer supply initiatives to reduce illicit drug overdose in BC

Frequent collaborators

Kora DeBeck

Kanna Hayashi

Kanna Hayashi

Thomas Kerr

Nadia Fairbairn

Evan Wood

Zach Walsh

Michael-John Milloy

Rolando Barrios

Seonaid Nolan

Mohammad Karamouzian

Julio Montaner

Mohammad Karamouzian

Sofia Bartlett

Agatha Jassem

Brittany Barker

Robert Hogg

Inna Sekirov

Danya Fast

Paxton Bach

Keith Ahamad

Brittany Barker

Mel Krajden