Our Research

Globally, tobacco use causes 8.7 million deaths annually. Approximately 50 % of formerly homeless adults in permanent supportive housing (PSH) in the United States smoke cigarettes. Secondhand smoke exposure is high in the absence of smoke-free policies. There is a need to understand attitudes toward smoke-free policies and factors associated with smoke-free home adoption attempts among PSH residents.

People experiencing homelessness have significantly lower life expectancies than the general population, and among those aged ≥ 45, tobacco-related illnesses are the leading cause of death.[1] Compared to the general population, tobacco use among people experiencing homelessness is six times higher, and the quit ratio (ratio of former to ever-smokers) is five times lower. [2],[3] We used the largest representative study of people experiencing homelessness since the 1990s to estimate tobacco use prevalence and its association with shelter status, behavioral health, and health services use among adults experiencing homelessness in California to identify opportunities to address unmet tobacco treatment needs.

Most people experiencing homelessness in California are not regular drug users — and for some, substance use begins or worsens after losing housing. Some use drugs to stay awake and safe, coping with the trauma and danger of life without shelter. At the same time, many who want treatment can’t get it. This paper uses data from the California Statewide Study of People Experiencing Homelessness to show a comprehensive, representative look at substance use, overdose risk, and unmet treatment needs among people experiencing homelessness in California.

This research letter discusses the experience of violence during homelessness, its impact on health, and recommendations for intervention. In the California Statewide Study of People Experiencing Homelessness, 38% of participants experienced violence during their current homelessness episode, and 74% of participants reported experiencing violence at some point in their lives. These results highlight the need to address violence against people experiencing homelessness through safer housing options, trauma-informed care, and long-term violence prevention strategies.

Deep-rooted racial residential segregation and housing discrimination have given rise to housing disparities among low-income Black young adults in the US. In this study, researchers aimed to illuminate the multiple forms of housing instability that Black young adults contend with and examine relationships between housing instability and mental health outcomes. They found that the high prevalence of housing instability and mental health challenges among low-income Black young adults require tailored interventions to reduce instability, given widening racial disparities and implications for future well-being into adulthood.

Existing literature on people experiencing homelessness (PEH) draws on non-representative samples from service providers, populations with comorbidities, or areas with disproportionately high sheltered homelessness, leading to bias. Nearly a third of PEH in the US and over half of unsheltered PEH live in California. Researchers from the UCSF Benioff Homelessness and Housing Initiative designed a rigorous state-representative survey of PEH to investigate the antecedents of homelessness, understand health, and inform policy solutions. This is the first large representative study of PEH, beyond a single county, to draw inference on a large population that did not depend on service utilization.

Before medically advised (BMA) discharge is associated with higher rates of readmission and death in other settings. In this study, researchers used multivariable logistic regression to evaluate the association between housing status and BMA discharge. Researchers found that BMA discharge is more common in patients experiencing homelessness after surgery even after adjusting for observable confounding characteristics. A deeper understanding of the drivers of BMA discharge in patients experiencing homelessness through qualitative methods is critical to promoting more equitable and effective care.

Depression is common in adults experiencing homelessness. In this cohort study, researchers examined the association between residential status and depressive symptoms in adults 50 years or older experiencing homelessness. Researchers found that continued homelessness was associated independently with increased odds of depressive symptoms.

Intimate partner violence (IPV) is a risk factor for people experiencing homelessness. Few studies have examined the interplay between IPV, homelessness, and housing. Researchers purposefully sampled 104 adults who reported experiencing IPV in the California Statewide Study of People Experiencing Homelessness (CASPEH), a representative, mixed-methods study. They identified six primary themes regarding IPV and homelessness.

Homelessness is associated with poor outcomes following cancer diagnosis. In this retrospective cohort study, researchers examined the association between housing status and acute care in adult patients treated for cancer at Zuckerberg San Francisco General Hospital. Researchers found that among patients receiving treatment for cancer at an urban public hospital, acute care use increased disproportionately in unhoused patients in the year of diagnosis, while psychiatric acute care use did not change.

People experiencing homelessness have worse mental and physical health than the general population. They also have limited access to primary care for reasons including the absence of health insurance, lack of money for co-payments or transportation, and communication barriers. In this JAMA Insights, researchers examine the adverse effects of homelessness on physical and mental health and suggest strategies to improve access to care.

Before medically advised (BMA) discharge, which refers to patients leaving the hospital at their own discretion, is associated with higher rates of readmission and death in other settings. There is limited information on whether housing status is associated with BMA after surgery. This study used multivariable logistic regression to evaluate the association between housing status and BMA discharge. Researchers found that BMA discharge is more common in patients experiencing homelessness after surgery.