Health
Marijuana Dependence Linked to Higher Risk of Death
Hospital and emergency room patients diagnosed with cannabis use disorder — defined as an inability to stop using cannabis even when the drug is causing harm — died at almost three times the rate of individuals without the disorder over the next five years, according to a study published on Thursday, the largest on the subject.
Patients with cannabis use disorder were 10 times as likely to die by suicide as those in the general population. They were also more likely to die from trauma, drug poisonings and lung cancer. Those numbers suggest that cannabis use disorder is about half as dangerous as opioid addiction and slightly less dangerous than alcohol use disorder, the researchers said.
A second report, published on Tuesday, found that more cases of schizophrenia and psychosis in Canada have been linked to cannabis use disorder since the drug was legalized.
“Many people think, ‘Oh, cannabis is not harmful — it’s organic, it’s natural; how great,’” said Dr. Laura Bierut, a psychiatrist at Washington University School of Medicine in St. Louis who is an author of an editorial accompanying the study of death risk. But the marijuana sold today is far more potent, and more harmful, than what baby boomers smoked in the 1960s and 1970s, she said.
“It is a public health threat just like alcohol,” Dr. Bierut said.
Recent research suggests that three in 10 cannabis users will develop cannabis use disorder, defined as being unable to stop using cannabis even though it’s causing serious health and social problems. As with alcohol, many people use marijuana recreationally without adverse effects or addiction.
The researchers took advantage of records in Ontario that capture millions of residents’ encounters with the government health system, which covers 97 percent of the population there.
From the records, the scientists in Thursday’s study identified 106,994 people who were diagnosed with cannabis use disorder during an emergency department visit or hospitalization between 2006 and 2021.
The researchers linked the records with vital statistics records and found that 3.5 percent of them died within five years of treatment for the disorder. In a matched comparison group of people of the same age and sex, the death rate was 0.6 percent.
The authors then made adjustments to account for other risk factors that may have contributed to their deaths, including mental health disorders, other substance use and conditions like heart disease and cancer.
Even when taking deaths by those other causes out of the equation, the researchers concluded that patients with cannabis use disorder were at a 2.8-fold increased risk of death compared with the general population. The risk was greatest in young adults ages 25 to 44.
Dr. Daniel Myran, an assistant professor of family medicine at University of Ottawa and the study’s first author, noted that these are most likely underestimates of cannabis’s toll.
“Our estimate is that for every person treated for C.U.D. there are another three who didn’t seek care,” he said. “So this is not just C.U.D., but bad enough that they sought care for it.”
He also noted that the study could not conclusively determine whether the cannabis itself increased death risk, or whether it was other lifestyle or health factors that happen to be more common among heavy cannabis users.
“Either way, this group is really, really high risk, and could benefit from intervention and monitoring and prevention,” he said.
On Tuesday, the same research group published a study looking at whether Canada’s recent legalization of marijuana affected rates of psychosis and schizophrenia.
Cannabis use has been associated with the development of schizophrenia, a serious mental illness, as well as transient psychotic episodes characterized by a loss of contact with reality. Some research has found no association between cannabis legalization and an increase in these disorders, but many studies are too small to detect changes in the prevalence of psychotic disorders, which are rare.
The new study analyzed cannabis-linked psychosis in Canada during three periods: before the country made cannabis legal (2006 to 2015), amid widening use of medical and nonmedical cannabis (2015-2018) and after the recreational use of cannabis was made legal (2018 to 2022).
The rates of schizophrenia were stable over time. But the percentage of cases attributable to cannabis use disorder increased to 10.3 percent during the legalization period, up from 3.7 percent before legalization, the authors found. The rate of psychosis (without a diagnosis of schizophrenia) nearly doubled after legalization.
Young adults ages 19 to 24 were most vulnerable, said Jodi Gilman, an associate professor of psychiatry at Harvard Medical School who wrote a commentary about the study.
“This is a period of the life span when the brain is still developing and still vulnerable to the effects of cannabis,” Dr. Gilman said. Psychosis and schizophrenia are also known to develop in young adulthood, she added, “so you have a double hit.”
Ants can be a nuisance. Just ask officials at a hospital in Canada who are dealing with an “appearance of ants within the operating room” that has forced them to indefinitely suspend some surgeries there.
The ants appeared recently at Carman Memorial Hospital in Carman Manitoba, according to a statement from Southern Health-Santé Sud, the provincial authority that oversees the hospital.
It was not clear when the hospital would resume operations, but Southern Health said on Friday that a “limited number of elective surgeries” had been postponed and that the hospital was working with patients to reschedule them. Portage Online, a local news website, reported that 16 operations had been postponed, citing information from Southern Health.
It’s not the first time ants have disrupted operations at the hospital. The insects appeared there in August 2024, but “the issue resolved within a few weeks,” Southern Health said. They returned last summer. But with their reappearance this week, the hospital said it was taking more drastic measures. The hospital serves the area around Carman, a town with a population of around 3,000 residents about 47 miles southwest of Winnipeg.
“Any factor that could impact the safety or integrity of the operating room environment requires the suspension of surgical activity until the issue can be resolved,” Southern Health said. “The safety of patients, staff and physicians is paramount.”
The hospital is working with exterminators “to identify the source of the ants and implement additional measures and support a long-term resolution.” Southern Health told Portage Online that exterminators had “surveyed and cleaned drains, opened walls and sealed cracks.”
“Several methods have been used to bait the ants in an effort to find where they are originating from,” the authority said.
In a separate statement to the CBC, Southern Health said that it believed that an ant colony had made its home near the hospital and that they appeared to be “simply seeking food sources inside buildings as ants are known to do.”
The hospital also told the CBC that the ant problem at the hospital did not amount to an “infestation.”
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The U.S. government is moving to evacuate American passengers from a cruise ship linked to a deadly hantavirus outbreak, with plans to transport them to a military base in Nebraska for quarantine and monitoring, federal health officials said Friday.
The Centers for Disease Control and Prevention said the risk to the American public remains extremely low as officials move forward with a medical repatriation flight for passengers aboard the M/V Hondius.
President Donald Trump said earlier Friday that the situation appears to be under control, pointing to the virus being difficult to transmit.
“We have very good people looking at it. It seems to be okay. They know the virus very well. They’ve worked with it for a long time. They know it very well. Not easy to pass on. So we hope that’s true,” he said.
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Health workers in protective gear evacuate patients from the MV Hondius cruise ship at a port in Praia, Cape Verde, on May 6, 2026. (Misper Apawu/AP)
“We seem to have things under very good control. They know that virus very well. It’s been around a long time. Not easily transferable, unlike COVID. But we’ll see. We have very good people studying it very closely.”
The outbreak has escalated over several weeks, beginning with a passenger who became sick in early April and later resulting in at least three deaths, according to the World Health Organization.
Cases are now reported across multiple countries after passengers disembarked in Africa and Europe, prompting health officials to trace contacts globally.
Authorities in Cape Verde at one point blocked passengers from leaving the ship, underscoring concerns about containment.
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An ambulance evacuates patients from the MV Hondius cruise ship to the airport in Praia, Cape Verde, on May 6, 2026. (Misper Apawu/AP)
Hantavirus is a rare but potentially deadly disease typically spread through contact with infected rodents or their droppings, according to the CDC. While most strains do not spread between people, health officials say the Andes virus — identified in some cases linked to the cruise ship — is the only known strain capable of limited person-to-person transmission.
The vessel is expected to dock in Spain’s Canary Islands, where international teams are coordinating next steps for passengers and crew.
A CDC team has been deployed to the Canary Islands to assess potential exposure among American passengers and determine monitoring needs.
Returning passengers are expected to be flown on a U.S. government medical repatriation flight to Offutt Air Force Base in Omaha, Nebraska.
Health workers in protective gear evacuate patients from the MV Hondius cruise ship into an ambulance at a port in Praia, Cape Verde, on May 6, 2026. (Misper Apawu/AP)
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They will then be transported to the National Quarantine Center at the University of Nebraska Medical Center for further monitoring.
Additional CDC personnel will be stationed at Offutt Air Force Base to support health assessments.
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From tracking sleep and steps to monitoring heart rate, temperature and stress levels, wearable devices like smartwatches and rings are growing in popularity as wellness tools.
Fox News’ Brian Kilmeade recently used one of these — an Oura ring — to track his metrics from the early morning hours through a demanding work schedule and reported the results live on “Fox & Friends.”
“I just got four hours and one minute [of sleep], but I have some REM sleep, 14%, over 20% of deep sleep. Feeling pretty good, I feel pretty fresh,” Kilmeade shared during his first early morning update, reviewing the stats from his ring.
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Throughout the day, the wearable tracked his physiological responses to various environments, from the stress of a live television broadcast to the physical exertion of a workout.
Wearable devices are changing cardiology’s landscape, helping detect conditions like atrial fibrillation early, a cardiologist said. (iStock)
Kilmeade observed the data in real time, noting, “You see the stress level spike just a little bit … as I make my way over to radio, my activity is going to pick up.”
By the end of his day, which included a trip to West Point and hours spent in a car, the device provided a summary of Kilmeade’s activity levels and heart rate stability.
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Dr. Craig Basman, a New Jersey cardiologist, joined the program to interpret the data and discuss the clinical implications of such technology.
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Basman immediately addressed Kilmeade’s limited rest. “Well, I don’t think you have to be a cardiologist to diagnose him with suboptimal sleep,” he said.
The cardiologist urged users to treat the data as a catalyst for lifestyle changes. (iStock)
However, the doctor highlighted the broader potential of these tools, explaining that “these wearable devices are changing the landscape of cardiology” and that “the future is bright, not just for preventative care … but also screening and detection of actual cardiovascular pathology.”
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The cardiologist urged users to treat the data as a catalyst for lifestyle changes, noting that he wouldn’t recommend detection tools unless you’re “going to do something about it.”
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Regarding the accuracy of the technology, Basman said there is “robust data” to suggest that the numbers are “incredibly accurate” for a lot of the metrics people are viewing, specifically data like resting heart rate and heart rate variability.
Wearable health tech like watches and rings can track sleep, heart rate and stress. (iStock)
He also mentioned that some devices can detect serious conditions like atrial fibrillation, which affects millions and can often go undetected during a standard physical exam.
For younger individuals, wearables can serve as a “great primary prevention tool,” according to the doctor, given that plaque can begin to develop in the arteries as early as the 20s and 30s.
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For the older population, the devices act more as a “screening tool for actual existing cardiac pathology,” he added.
Anyone concerned about wearable health data should consult a doctor for medical guidance.
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