Does Medical Marijuana Mean Fewer Sick Days in the Workplace?

A study found that medical marijuana decriminalization reduced health-related workplace absenteeism by about 6.9%. The effect was strongest when researchers measured policy exposure using the effective dates of decriminalization, and it was most pronounced in physically demanding jobs like manufacturing and agriculture.

Most conversations about cannabis policy circle back to the same talking points like tax revenue, crime, public health. But there’s a quieter story playing out on factory floors, farms, and job sites across the country: people are calling out of work less often where medical marijuana is legal.

That’s the headline finding from a new study by researchers at the University of Southern Maine and the University of Georgia, published in the Journal of Workplace Behavioral Health in its June edition. The team dug into nearly 35 years of federal data to answer a deceptively simple question, does legalizing medical cannabis change how often workers miss work for health reasons?

The short version: yes, it does. And the details are worth a closer look, especially if you work in a trade where chronic pain comes with the territory.

What Did the Study Actually Find?

The research team, Eklou R. Amendah, Patryk Babiarz, and Kavitha Rabindran analyzed monthly data from the Current Population Survey, the same federal survey run by the U.S. Census Bureau and the Bureau of Labor Statistics. Their dataset covered January 1990 through March 2025 and included more than 20 million workers between the ages of 18 and 61.

After medical cannabis decriminalization took effect, workers were roughly 6.9% less likely to report missing work because of illness, injury, or another medical issue. The result was statistically significant at the 1% level, which in research terms means it’s very unlikely to be a fluke.

Here’s the part that surprised some observers: the timing of the law mattered. The study measured cannabis policy two different ways, the date use was decriminalized, and the date regulated sales actually started. Decriminalization carried the bigger, more reliable effect. As the authors put it, the impact was clearest “when policy exposure is measured using the effective dates of decriminalization.”

Why Does Decriminalization Matter More Than Legal Sales?

This is one of the more interesting wrinkles in the research. You’d think the moment dispensaries open their doors would be when the real change happens. But the data tells a different story.

The likely reason comes down to access on the ground. In several states like California, Colorado, Michigan, Montana, and Oregon among them. Patients were already getting cannabis through unlicensed or quasi-legal dispensaries well before the official “sales commenced” date. By the time regulated retail launched, the therapeutic benefit had already kicked in for many workers.

The gap between the two dates can be huge. The study notes that for medical cannabis, the average lag between decriminalization and the first legal sale ran about 26 months for most states, and stretched past 10 years for a handful. So measuring policy by the sales date alone misses a lot of what’s actually happening in people’s lives.

Which Jobs Saw the Biggest Drop in Absenteeism?

This is where the findings get specific—and where they make intuitive sense. The reductions weren’t spread evenly across every profession. They clustered in occupations and industries built around physical labor, repetitive strain, and the kind of chronic pain that medical cannabis is often used to treat.

By occupation, the standouts were:

• Fabricators, assemblers, and manual laborers: roughly 39% fewer health-related absences
  
• Industrial machine operators: 33% fewer
  
• Health service workers (dental assistants, nursing aides): 32% fewer
  
• Farm workers: 18% fewer
  
• Food preparation workers: 10% fewer
  
• Construction workers: 10% fewer (marginally significant)

By industry, the pattern held:

• Durable goods manufacturing: 31% reduction
  
• Nondurable goods manufacturing: 16%
  
• Agriculture: 16%
  
• Construction: 9%
  
• Business services: 8%

The researchers summed it up plainly: “The most substantial reductions in health-related work absenteeism due to medical cannabis decriminalization are observed in occupations and industries that involve physical demands and repetitive strains of work.”

Worth noting—no occupation or industry showed a statistically significant increase in absenteeism after medical cannabis decriminalization.

Does Education or Age Change the Picture?

It does, and the breakdown is striking. The effect was concentrated almost entirely among workers with a high school education or less. For those without a high school diploma, decriminalizing medical cannabis cut health-related absences by about 26 basis points, a 36% reduction measured against the overall sample average. That’s several times larger than the effect for the workforce as a whole.

The benefit also skewed slightly toward older workers and men, groups more likely to deal with the chronic, physical conditions cannabis tends to be used for. Among racial and marital groups, the statistically significant effects showed up for White and married respondents.

What About Recreational Cannabis?

Here the study draws a clear line. Recreational cannabis legalization showed no statistically significant effect on health-related workplace absenteeism—whether the researchers measured it by decriminalization dates or by the start of legal sales.

That distinction matters. It suggests the absenteeism benefit isn’t about cannabis being available in general. It’s specifically tied to the therapeutic, medical use channel—people managing real health conditions, not recreational consumption.

The authors are careful here. Their data doesn’t directly track who’s using cannabis or why, so they can’t watch the mechanism in action. But the pattern—benefits concentrated in painful, physical jobs, driven by medical decriminalization—lines up neatly with what they call a “therapeutic channel through which medical cannabis access improves symptom management and reduces sickness absence.”

How Does This Fit With Other Workplace Research?

This study doesn’t stand alone. It builds on and helps reconcile a body of sometimes-conflicting research.

Back in 2017, economist Darin Ullman was the first to show that legalizing medical cannabis reduced sickness absences, estimating workers were 8% less likely to miss work for health reasons after state-level reform. The new study extends that work by nearly a decade of additional data, capturing medical decriminalization in 19 more states after 2012.

Other research rounds out the picture. A study on workers’ compensation found that legalization was tied to lower average costs per claim and reduced use of prescription drugs—especially opioids and painkillers. A 2021 National Bureau of Economic Research analysis linked adult-use legalization to higher workforce productivity and fewer workplace injuries among older adults. The common thread across these studies is improved pain management as a driver of better work capacity.

What Does This Mean for Workers and Employers?

For an industry that’s spent years fighting for legitimacy, findings like these add real weight to the argument that medical cannabis serves a genuine therapeutic purpose. When workers in physically grueling jobs gain legal access to a pain-management option, they show up more often. That’s good for them, and it’s good for the businesses that employ them, workplace absenteeism costs U.S. employers an estimated $225 billion a year in lost productivity, according to the CDC Foundation.

A few caveats keep things honest. The study measures self-reported absences over a single week, so it can’t track how long absences lasted or pin down the exact health conditions involved. Cannabis also remains federally illegal, and employers can still enforce zero-tolerance drug policies regardless of state law. And long-term, heavy cannabis use carries its own documented health risks.

Still, the signal is clear and backed by one of the largest datasets ever brought to this question. Medical cannabis access appears to help the workers who need it most. the ones whose bodies take a beating on the job. stay on the clock.

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