The Deadliest Wildfire in Modern US History Is Teaching Us That the Fire Is Only Half the Harm

That result is changing how researchers think about what disaster recovery actually needs to do.

What the study is

Once a month, University of Hawaiʻi researchers fly medical equipment from Oʻahu to west Maui and turn a local health center into a temporary lab, collecting blood, urine, DNA, lung function, and mental health measures from wildfire survivors. The Maui Wildfire Exposure Study, MauiWES, is one of the largest and most comprehensive postfire investigations in the country, designed to follow participants for a decade or more to see whether they develop cancers, lung disease, and other conditions linked to fire exposure.

What makes it scientifically valuable is who it enrolls. It is the largest and most ethnically diverse longitudinal cohort in any US postfire study, including Native Hawaiian, Pacific Islander, Hispanic, Filipino, Asian, and white residents, with 91% of participants having lived or worked in Lāhainā during the fire. That diversity matters because most of what is known about disaster health comes from less representative populations, and the communities hit hardest here were already facing health disparities and limited access to care before the fire.

The finding that reframes everything

The headline result, published in JAMA Psychiatry, is counterintuitive enough to change practice. The fires triggered an island-wide mental health crisis, and more than half of the disaster's impact on depression and anxiety could be traced to increased housing and job insecurity rather than to the trauma of the fire itself.

The numbers make the point precisely. People inside the burn zones had a 53% higher risk of depression and a 67% higher risk of anxiety. But for wildfire survivors, housing and job insecurity explained nearly 62% of the depressive symptoms and 77% of the anxiety symptoms the disaster caused. And the harm did not respect the edge of the burn zone. Maui residents who lived outside the fire areas also showed significantly elevated risks, including more than double the risk of suicidal thoughts.

Sit with what that means. The thing most damaging to mental health was not proximity to the flames. It was losing your home and your income, which can happen to someone whose house never burned, in a place where the fire destroyed so much housing and economic activity that the disruption rippled across the whole island. As the study's lead author put it, housing displacement and income loss were not side issues but central drivers of psychological harm.

One corollary from the same data points straight at a solution: being employed was strongly protective against depression, anxiety, and suicidal thoughts. That is not a soft observation. It says that economic recovery is mental health treatment, that getting people back into stable housing and work does clinical good that is otherwise hard to achieve.

Why this changes the recovery playbook

The conventional model of disaster response treats the acute event as the emergency: put out the fire, treat the injured, provide short-term shelter, then wind down as the crisis passes. This study is evidence that the model ends too early and aims at the wrong target.

If most of the lasting psychological harm flows from housing and job loss, then the recovery that actually protects health is not measured in weeks of emergency response. It is measured in how fast people get back into permanent homes and stable work, which in Lāhainā has been painfully slow, with fewer than 300 homes rebuilt as of this summer against thousands destroyed and roughly 10,000 people displaced. Every month of delayed rebuilding is not just a housing problem. On this evidence, it is an active mental health harm, prolonging the exposure that drives the depression and anxiety.

That reframing has a practical edge. It means the agencies responsible for housing, permitting, and economic recovery are, functionally, mental health agencies after a disaster, whether or not anyone describes them that way. And it means a recovery judged successful on physical rebuilding metrics can still be failing on the measure that matters most to survivors, if it leaves people in limbo for years.

The physical health signals are real too

The mental health findings are the most developed, but the study is also tracking bodies, and the early readings warrant the long timeline. Among adults enrolled six to 14 months after the fires, 22% showed reduced lung function and 50% screened positive for depressive symptoms. Later reporting from the study found more than 40% of adults reporting worsening health, nearly 75% with elevated blood pressure, and more than a quarter with worsening lung function, alongside more than half of children aged 8 to 18 screening positive for depression.

These are screening findings from an exposed cohort, not proof that the fire caused each condition, and the study is careful about that distinction, which is exactly why it is designed to run for a decade or two. Urban wildfires like Lāhainā burn homes, cars, plastics, and industrial materials, producing a chemical mix quite different from a forest fire, and the long-term consequences of breathing that are genuinely not well understood. The value of following the same people for years is that it can separate lasting effects from transient ones in a way a snapshot never could.

The part that makes this fragile

There is a hard irony in the timing. This study exists to show that long-term support matters, and its own long-term funding is uncertain. Hawaiʻi cut state funding for the study earlier this year, with a $3 million request described as crucial to continue screenings, return results, provide referrals, and expand care to a waitlist that includes 1,000 children. NIH has renewed a portion of the funding, but the gap between what the study needs and what it has is real.

That threatens something beyond the research. For many participants, MauiWES is not only a study; it is a source of actual screening and referral in a community with limited access to care, the mechanism by which someone learns their lung function has declined or their blood pressure is dangerous. Defunding it removes both the knowledge and, for some, the care.

A study researcher drew a comparison worth taking seriously, to September 11, where in the years afterward more people died from illnesses linked to the exposure than in the attack itself, and where a long-term health program eventually became essential precisely because the delayed harms were not visible at first. The parallel is a warning: the costs that show up later are easy to underfund now, exactly because they have not shown up yet. Investing in prevention and monitoring is cheaper than treating the crises that arrive when no one was watching, but only if the monitoring survives long enough to do its job.

Lāhainā is teaching a lesson that applies well beyond Maui, as wildfires grow more frequent and more likely to reach towns rather than just wildland. The fire is the visible disaster. The invisible one is the slow grind of displacement, lost income, and prolonged instability, and on this evidence that second disaster does more lasting damage to mental health than the first. The most important finding of the largest postfire study in the country is almost administrative in its plainness: what you do in the years after the fire matters as much as the fire, and the recovery is not over when the emergency ends. It is over when people are home.

If you or someone you know is struggling in the aftermath of a disaster or experiencing thoughts of suicide, support is available. In the US, the 988 Suicide and Crisis Lifeline can be reached by calling or texting 988.

Further reading

• STAT, on the study's design and the pace of rebuilding
• Honolulu Civil Beat, on the JAMA Psychiatry findings
• AsAmNews, on the state funding cut and the September 11 comparison