K Hayashi
Biographic Data
| ID | 27531 |
|---|---|
| NAME | K Hayashi |
| GIVEN NAMES | K |
| FAMILY NAME | Hayashi |
| SIGNATURE | HAYASHI K |
| AFFILIATIONS | Simon Fraser University |
| ORCID | 0000-0003-3843-2928 |
| VERIFIED | Yes |
| TOTAL WORKS | 97 |
| TOTAL CITATIONS | 21 |
| AUTHOR COUNT | 97 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2009 |
| LATEST PUBLICATION YEAR | 2026 |
| H-INDEX | 2 |
Prevalence and Correlates of Reporting a Gabapentin Prescription for Pain Among People Who Use Opioids
Payday Loan Use Among People With Lived and Living Experience of Substance Use
Gender differences in the association between housing status and violence among people who report exposure to benzodiazepines
BACKGROUND: Benzodiazepine exposure through the contaminated unregulated drug supply is associated with heightened risk of violent victimization, particularly for women. It is critical to identify the structural factors that intersect with drug toxicity and condition vulnerability to violence. As such, we conducted a gender-based analysis of the impacts of stable housing on violence among a sample of people exposed to benzodiazepines. METHODS: Us…
Willingness to use microbicides among females who use unregulated drugs in Vancouver, Canada
Microbicides are an emerging HIV-focused biomedical intervention offering protection against HIV. Despite potential benefits, willingness to use these products has not been well studied, especially among females who use unregulated drugs. Between June 2021 and May 2022, data were drawn from two prospective cohorts of people who use drugs in Vancouver, Canada. Analyses focused on participants who were female sex at birth and sexually active. Multi…
Difficulty accessing substance use treatment among Indigenous people in a Canadian inner city setting
Objectives: Indigenous people in Canada continue to suffer from higher rates of opioid overdose death than non-Indigenous groups. Although substance use treatment remains a key strategy in the context of the overdose crisis, the barriers to timely substance use treatment access among Indigenous people have not been well-characterized. This study aims to identify factors affecting treatment access for Indigenous residents in Vancouver, BC. Methods…
The Gender Segregation of Precarious Work Contexts Among People Who Use Drugs
Confiscations, public health obstructions, and perpetual displacement
Our findings illustrate how harmful law enforcement practices that target people who use criminalized drugs, particularly those relying on public spaces for survival, persisted during the evolving drug policy periods. Together, these law enforcement practices along with the lack of understanding regarding the shifting Decriminalization Pilot, may have undermined the potential success of a policy dedicated to decriminalizing drug possession in BC
Evaluation of global research on agricultural nitrogen pollution between 1990 and 2023
Excessive and inefficient nitrogen (N) use in agriculture poses pervasive environmental threats for Water quality, Air quality, Greenhouse gas emissions, Ecosystems and biodiversity, and Soil (WAGES). However, it is unclear whether the global distribution of research corresponds to the severity of these threats. Here we provide a global assessment linking research outputs across WAGES with cropland N surplus, a proxy for the severity of N threats…
‘It just doesn't stop’
Cannabis use and illicit opioid cessation among people who use drugs living with chronic pain
Longitudinal polysubstance use patterns and non-fatal overdose
Community-administered naloxone for overdose reversal
Over 5.5 years, over half of participants administered THN, which was associated with exposure to sex work-specific programs and occupational violence. Violence from clients, community members, and police independently increased the likelihood of THN administration. Findings suggest that marginalized sex workers, particularly those who use drugs in occupational settings, are uniquely positioned to respond to overdoses. This supports the feasibili…
Drug Dependence Severity and Associated Factors Among Cisgender Gay, Bisexual and Other Men Who Have Sex With Men in Japan
This study aimed to assess the severity of drug dependence and identify factors associated with high dependence among gay, bisexual, and other men who have sex with men (gbMSM) in Japan. Data were collected from a nationwide community-based online survey conducted from November 2022 to January 2023. gbMSM with a history of drug use completed the Japanese version of the Drug Abuse Screening Test-20 (DAST-20). Multivariable logistic regression expl…
Patterns of socioeconomic marginalization and non-fatal overdose among people who use drugs
Preferred pharmaceutical-grade opioids to reduce the use of unregulated opioids
Impacts of the Covid-19 pandemic on the availability and retail price of unregulated drugs in Vancouver, Canada
Patterns of Socioeconomic Marginalization among People Who Use Drugs
Longitudinal latent polysubstance use patterns among a cohort of people who use opioids in Vancouver, Canada
Latent polydrug use patterns and the provision of injection initiation assistance among people who inject drugs in three North American settings
Associations between Drug Use and Sexual Risk Behaviours among Men Who Have Sex with Men in Japan
This study assessed drug use patterns among men who have sex with men (MSM) in Japan, and evaluated their potential associations with sexual risk behaviours. Between September and October 2016, study subjects were recruited through a cross-sectional survey (LASH: Love Life and Sexual Health) using a geosocial networking application for MSM. Of the participants, 25.4% (1756/6921) reported ever having used drugs, and 11.3% (780/6921) reported havin…
The Impact of Longitudinal Substance Use Patterns on the Risk of Opioid Agonist Therapy Discontinuation
The online version contains supplementary material available at 10.1007/s11469-023-01098-8
Experiences of violence during the Covid-19 pandemic among people who use drugs in a Canadian setting
Our study results suggest economic conditions and gender were major factors associated with experiencing violence among our sample of PWUD during COVID-19. These findings highlight criminalization of drug use and widespread socioeconomic challenges as barriers to addressing violence among PWUD during periods of crisis
Food insecurity during the Covid-19 pandemic who use drugs in Vancouver, Canada
Objective: To examine prevalence and factors associated with food insecurity among people who use drugs (PWUD) during the first year of the COVID-19 pandemic and the overdose crisis. Design: This cross-sectional study employs multivariable logistic regression to identify factors associated with self-reported food insecurity. Participants: PWUD who are part of three community-recruited cohorts. Setting: Interviews conducted in Vancouver, Canada, v…
Association of sex work and social-structural factors with non-fatal overdose among women who use drugs in Vancouver, Canada
Impacts of the Covid-19 pandemic on enrollment in medications for opioid use disorder (Moud) in Vancouver, Canada
Despite immediate improvements in MOUD enrollment in the post-COVID-19 period, this beneficial trend reversed over time. RMG opioids appeared to have provided additional benefits to sustain retention in OUD care
(Re)shaping the self
Criminalizing Sex Work Clients and Rushed Negotiations among Sex Workers Who Use Drugs in a Canadian Setting
Use of Cannabis for Harm Reduction Among People at High Risk for Overdose in Vancouver, Canada (2016–2018)
Objectives. To characterize the prevalence and reasons for the use of cannabis as a strategy to reduce the harms arising from other substances. Methods. We drew data about recent cannabis use and intentions from 3 prospective cohort studies of marginalized people who use drugs based in Vancouver, Canada, from June 2016 to May 2018. The primary outcome was “use of cannabis for harm reduction,” defined as using cannabis for substitution for licit o…
The relationship between violence and engagement in drug dealing and sex work among street-involved youth
Patterns of socioeconomic marginalization and non-fatal overdose among people who use drugs
A paradox of need
In Canada, publicly funded healthcare provides no-cost access to a large but not comprehensive suite of services. Dental care is largely funded by private insurance or patients, creating employment- and income-dependent gaps in care access. Difficulties accessing dental care may be amplified among vulnerable populations, including people who use drugs (PWUD), who may experience greater dental need due to side effects of substance use and health c…
Material Security as a Measure of Poverty
Frequent Cannabis Use and Cessation of Injection of Opioids, Vancouver, Canada, 2005–2018
Objectives. To evaluate the impact of frequent cannabis use on injection cessation and injection relapse among people who inject drugs (PWID). Methods. Three prospective cohorts of PWID from Vancouver, Canada, provided the data for these analyses. We used extended Cox regression analysis with time-updated covariates to analyze the association between cannabis use and injection cessation and injection relapse. Results. Between 2005 and 2018, at-le…
Benzodiazepine Use and Hepatitis C Seroconversion in a Cohort of Persons Who Inject Drugs
Objectives. To examine the relationship between benzodiazepine (BZD) use and HCV seroconversion in 2 linked prospective cohorts of persons who inject drugs (PWID). Methods. We examined prospective cohorts of 440 PWID (baseline BZD users: n = 102; 23.2%) from the AIDS Care Cohort to Evaluate Access to Survival Services (ACCESS) and the Vancouver Injection Drug Users Study (VIDUS) cohorts, followed-up from 1996 to 2013 in Vancouver, Canada. Results…
Increased drug use and the timing of social assistance receipt among people who use illicit drugs
Reports of evidence planting by police among a community-based sample of injection drug users in Bangkok, Thailand
BACKGROUND: Drug policy in Thailand has relied heavily on law enforcement-based approaches. Qualitative reports indicate that police in Thailand have resorted to planting drugs on suspected drug users to extort money or provide grounds for arrest. The present study sought to describe the prevalence and factors associated with this form of evidence planting by police among injection drug users (IDU) in Bangkok. METHODS: Multivariate logistic regre…
Incarceration experiences among a community-recruited sample of injection drug users in Bangkok, Thailand
Over three-quarters of the IDU participating in this study reported a history of incarceration, and 30% of these individuals reported injection drug use within prison. Further, an alarmingly high level of syringe sharing within prison was reported, and incarceration was not associated with reductions in drug use. These findings provide further evidence of the need for community diversion strategies, as well as harm reduction programs, in Thai pri…
An external evaluation of a peer-run outreach-based syringe exchange in Vancouver, Canada
Expanding the reach of harm reduction in Thailand
Compulsory drug detention center experiences among a community-based sample of injection drug users in Bangkok, Thailand
BACKGROUND: Despite Thailand's official reclassification of drug users as "patients" deserving care and not "criminals," the Thai government has continued to rely heavily on punitive responses to drug use such as "boot camp"-style compulsory "treatment" centers. There is very little research on experiences with compulsory treatment centers among people who use drugs. The work reported here is a first step toward filling that gap. METHODS: We exam…
HIV testing and willingness to get HIV testing at a peer-run drop-in centre for people who inject drugs in Bangkok, Thailand
More than three-quarters of IDU received HIV testing in the previous six months. However, HIV risk behaviour was common among those who had not been tested. Additionally, 74.2% of participants were willing to receive HIV testing at the MSHRC. These findings provide evidence for ongoing HIV prevention education, as well potential benefits of incorporating HIV testing for IDU within peer-led harm reduction programs
HIV Test Avoidance Among People Who Inject Drugs in Thailand
Case identification is a key component of HIV prevention efforts; yet rates of HIV testing remain low in some settings. We explored factors associated with HIV test avoidance among people who inject drugs (IDU) in Thailand. Between July and October 2011, 350 Thai IDU participated in the study. In bivariate analyses, male gender, high intensity drug use, syringe sharing, increased police presence, and being refused healthcare services were positiv…
Reports of police beating and associated harms among people who inject drugs in Bangkok, Thailand
A high proportion of IDU in Bangkok reported having been beaten by the police. Experiencing police beating was independently associated with various indicators of drug-related harm. These findings suggest that the over-reliance on enforcement-based approaches is contributing to police-perpetrated abuses and the perpetuation of the HIV risk behaviour among Thai IDU
The Effect of Exposures to Policing on Syringe Sharing Among People Who Inject Drugs in Bangkok, Thailand
Experiences with urine drug testing by police among people who inject drugs in Bangkok, Thailand
The impact of compulsory drug detention exposure on the avoidance of healthcare among injection drug users in Thailand
Impact of unstable housing on all-cause mortality among persons who inject drugs
These findings demonstrate that unstable housing is an important risk factor for mortality independent of known risk factors including HIV infection and patterns of drug use. This study highlights the urgent need to provide supportive housing interventions to address elevated levels of preventable mortality among this population
Police interference with methadone treatment in Bangkok, Thailand
Increasing awareness about HIV prevention among young people who initiated injection drug use in a Canadian setting, 1988–2014
Non-fatal overdose as a risk factor for subsequent fatal overdose among people who inject drugs
Risky and rushed public crack cocaine smoking
A high prevalence of public crack smoking and rushed public crack smoking was observed in this setting. These findings point to the need for implementing and evaluating evidence-based public health interventions, such as supervised inhalation facilities, to reduce the risks and harms associated with smoking crack in public
Non-medical prescription opioid use predicts injection initiation among street-involved youth
Knowledge translation to advance evidence-based health policy in Thailand
Significant gaps between scientific evidence and policy have resulted in growing interest in the role that knowledge translation (KT) can play in informing evidence-based policy. The Mitsampan Community Research Project, in consultation with the local community of people who inject drugs, developed a comprehensive KT strategy that aimed to translate research into policy related to HIV and illicit drug use in Bangkok, Thailand. Though barriers to …
Benzodiazepine Use and Hepatitis C Seroconversion in a Cohort of Persons Who Inject Drugs
Objectives. To examine the relationship between benzodiazepine (BZD) use and HCV seroconversion in 2 linked prospective cohorts of persons who inject drugs (PWID). Methods. We examined prospective cohorts of 440 PWID (baseline BZD users: n = 102; 23.2%) from the AIDS Care Cohort to Evaluate Access to Survival Services (ACCESS) and the Vancouver Injection Drug Users Study (VIDUS) cohorts, followed-up from 1996 to 2013 in Vancouver, Canada. Results…
The relationship between violence and engagement in drug dealing and sex work among street-involved youth
Increased drug use and the timing of social assistance receipt among people who use illicit drugs
Declining rates of health problems associated with crack smoking during the expansion of crack pipe distribution in Vancouver, Canada
These findings suggest that the expansion of crack pipe distribution services has likely served to reduce health problems from smoking crack in this setting. They provide evidence supporting crack pipe distribution programs as a harm reduction service for crack smokers
Residential eviction and exposure to violence among people who inject drugs in Vancouver, Canada
Knowledge of hepatitis C and treatment willingness amongst people who inject drugs in an era of direct acting antivirals
Criminalizing Sex Work Clients and Rushed Negotiations among Sex Workers Who Use Drugs in a Canadian Setting
Medicine (86 works) · HIV, Drug Use, Sexual Risk (77 works) · Opioid Use Disorder Treatment (57 works) · Psychiatry (56 works) · Environmental health (49 works) · Internal Medicine (48 works) · Demography (44 works) · Psychology (34 works) · Demography (31 works) · Logistic regression (30 works)