UK Study: Problem Gambling Hits Quality Of Life As Hard As Cocaine

A large-scale study on gambling-related harms in the United Kingdom has produced some eye-popping numbers about how gambling affects people’s wellbeing, and the findings put gambling, in all forms, in the same league as some heavy-hitting substances.

The Gambling Harms Severity Index, developed by researchers at the National Centre for Social Research and published in January 2026, measured the quality of life impacts on more than 4,500 people in Great Britain. What they found might surprise even the most pro-gambling advocates: Severe gambling harm reduces quality of life by roughly 32-35%, a figure the researchers say is “equivalent to or exceeding those seen in major health conditions, such as depression and opiate dependence.”

Using a method called “multi-criteria decision analysis,” the same approach previously used to compare harms from different substances, the research team established that gambling harms are “comparable to those from cocaine and alcohol.”

While that might not be terribly surprising if considering the small number of confirmed problem gamblers, the study did note the impacts are not limited to problem gamblers. In short, we’ve got a bit of a long-tail issue here — if the study is to be believed.

The research shows most of the total harm across the population doesn’t come from the relatively tiny number of people experiencing severe problems. Instead, it comes from the much larger group experiencing low-to-moderate harm. The study calls this a “prevention paradox,” where “most population-level harm arises from the large number of people experiencing low-to-moderate harm, rather than the smaller number experiencing severe harm.”

In practical terms, each one-point increase on the study’s 30-point harm scale was linked to about a 1.5% reduction in quality of life. The researchers note that moving between harm categories — say, from high to moderate — represents what they call a “minimally clinically important difference,” meaning it’s substantial enough that people actually notice the change in their daily lives.

Ripple effect on relationships

The study also documented the ripple effects on family members. Partners and close relatives of people who gamble experienced quality-of-life decrements “essentially on par with the individuals who gamble,” according to the report. 

To measure these impacts, researchers used the same health economics tools employed by the NHS and the National Institute for Health and Care Excellence when evaluating other health conditions. They surveyed both people who gamble and “affected others” (partners, children, parents, and close friends), measuring everything from financial strain and relationship breakdowns to mental and physical wellbeing.

The research team also developed two new measurement tools: the GHSI-10 for people who gamble and the GHSI-AO-10 for affected others. Unlike older diagnostic tools that focus on identifying “problem gamblers,” these instruments measure actual harm across three different elements: resources (financial impacts, work and study disruption), wellbeing (mental and physical health), and relationships.

These new tools were co-developed through workshops with people who’ve experienced gambling harms, affected family members, and service providers, an approach the researchers say helps reduce stigma and encourages honest responses.

The findings arrive as Britain shifts toward treating gambling more like a public-health issue, similar to alcohol and drugs.