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.”
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The simple act of noting how fast your heart is beating while you’re at rest may be the key to measuring your overall health.
Resting heart rate is defined by Mayo Clinic as the number of times your heart beats each minute while you’re awake, calm and not moving.
A normal resting heart rate ranges from 60 to 100 beats per minute for adults. A slower resting heart rate means the heart does not have the work as heard to pump blood through the body — something typical of someone who is more fit.
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Athletes who are very fit may have a resting heart rate closer to 40 beats per minute, according to Mayo Clinic.
Your resting heart rate can vary due to a variety of factors, including age, physical activity levels, sleep health, smoking, cardiovascular disease, high cholesterol, diabetes, stress, anxiety, hormones, body type and certain medications.
A normal resting heart rate ranges from 60 to 100 beats per minute for adults, according to medical experts. (iStock)
But a resting heart rate that’s often too high or too low may signal a health issue.
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A high resting heart rate, even if it’s slight, is usually a sign that something else may be going on in the body, such as anemia, an infection or a thyroid problem, according to Cleveland Clinic.
A high resting heart rate, even if it’s slight, is usually a sign that something else may be going on in the body. (iStock)
If your heart rate is regularly above 100 beats per minute, this is a sign to talk with your heart care provider.
The same advice applies if you are not a trained athlete and your resting heart rate is frequently below 60 beats per minute.
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Talk to your doctor if other symptoms such as fainting, dizziness or shortness of breath occur.
How to measure your heart rate
You can check your own heart rate by tracking your pulse on your wrist or neck. The best time of day to measure resting heart rate is first thing in the morning, says Mayo Clinic.
Place your index and middle fingers inside the wrist below the thumb, to feel the radial artery; or, do so on the side of the neck, to feel the carotid artery.
Place your index and middle fingers on the side of the neck, to feel the carotid artery — and count how many beats per minute. (iStock)
Count the number of times your pulse beats in 15 seconds, then multiply this number by four to calculate beats per minute.
Wearable devices can also detect and track resting heart rate, although this may not always be accurate.
How to lower your heart rate
If your resting heart rate is higher than normal, there are a few ways to work toward lowering it.
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Vigorous exercise is “the best way” to lower your resting heart rate and increase the heart’s aerobic capacity and max heart rate, according to Harvard.
For those who don’t exercise regularly, it’s important to work your way up in difficulty when following a new workout routine.
Vigorous exercise is “the best way” to lower your resting heart rate, Harvard Health says. But it’s vital to work your way up carefully. (iStock)
Some medications, such as beta blockers, can also lower heart rate. In the same way, managing stress through holistic methods such as meditation or yoga can also help.
Cleveland Clinic also recommends cutting back on harmful substances such as drugs and alcohol, which can dehydrate you and raise your heart rate.
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Adequate sleep can also help bring your heart rate down, in addition to maintaining a healthy weight.
Cardiologist Tamanna Singh, M.D., shared with Cleveland Clinic that lowering your heart rate takes time as various lifestyle changes kick in.
Managing stress through holistic methods such as meditation or yoga can help lower your resting heart rate,
“Just like building your biceps and triceps, it takes time for your heart to become stronger,” the doctor said.
Singh recommended focusing on heart rate patterns rather than dialing in on just the number.
Take note of how your heart rate changes after eating certain foods, when you’re dehydrated or after you’ve begun a new exercise or stress management routine.
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“If you notice that your heart rate is consistently over 100, mention it to your doctor, especially if you’ve tried making lifestyle changes and they don’t seem to be working,” she said.
“Your resting heart rate isn’t the be-all, end-all of your health, but it’s definitely a marker that you should pay attention to.”
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The health benefits of morning coffee may go beyond a wake-up call, according to a massive new study linking the beverage to a significantly lower risk of severe liver disease, liver cancer and liver-related death.
Published in the journal Clinical Gastroenterology and Hepatology, the research used data from 354,957 participants enrolled in the UK Biobank.
Researchers tracked individuals who had no history of cirrhosis or liver cancer at the start of the study for an average of 13 years, according to a press release.
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Participants who drank one to two cups of coffee daily showed a 20% lower risk of developing cirrhosis and a 31% lower risk of liver-related mortality compared to non-coffee drinkers.
The protective effects became even more noticeable at higher levels of consumption.
Data revealed that heavy coffee drinkers had significantly lower levels of liver fat and liver iron. (iStock)
Individuals who drank five or more cups of coffee per day experienced a 32% reduction in cirrhosis risk, a 42% lower risk of liver-related death and a 47% lower risk of developing hepatocellular carcinoma, the most common form of primary liver cancer.
While previous studies have hinted at coffee’s positive relationship with liver health, this study provides biological evidence to support the statistical trends, the researchers said.
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To better understand why coffee may protect the liver, the researchers conducted additional analyses using imaging data from a subgroup of nearly 29,000 participants and blood samples from approximately 50,000 individuals.
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The data showed that heavy coffee drinkers had significantly lower levels of liver fat and liver iron, as well as lower odds of developing fibroinflammation, which is the scarring and inflammation that often precedes permanent liver damage.
Participants who drank one to two cups of coffee daily showed a 20% lower risk of developing cirrhosis. (iStock)
The blood analysis linked coffee consumption with lower levels of some proteins known to trigger inflammation and tissue scarring, along with higher levels of proteins essential for healthy liver function.
Notably, the study found that the liver-protective benefits were similar for both caffeinated and decaffeinated coffee, suggesting that these benefits are driven by naturally occurring compounds not related to caffeine.
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While the benefits persisted regardless of whether the coffee was consumed black or with sweeteners, the researchers observed that adding sugar or artificial sweeteners slightly weakened the beneficial effects, particularly concerning markers of liver inflammation.
Researchers observed that adding sugar or artificial sweeteners slightly weakened the positive effects. (iStock)
While these findings suggest that coffee consumption is an accessible dietary habit for supporting liver health, the authors noted that it should serve as a complement rather than a replacement for standard preventative health practices.
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Because the research relied on self-reported dietary questionnaires from the UK Biobank, the findings could be susceptible to changes in participants’ coffee-drinking habits over the 13-year follow-up period.
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Additionally, as an observational study, it can only establish a strong correlation and cannot prove cause and effect, as other factors may influence the outcomes.
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