Health
Study Links High-Potency Cannabis to Greater Risk of Psychosis and Addiction
A sweeping new analysis has found that cannabis products with high levels of the psychoactive compound THC may significantly raise the risk of psychosis, schizophrenia, and addiction, heightening concerns among researchers and health officials as cannabis use rises worldwide.
The study, published in the Annals of Internal Medicine, reviewed 99 research papers conducted between 1977 and 2023, covering more than 220,000 people. It concluded that products containing higher concentrations of delta-9-tetrahydrocannabinol (THC) — the chemical responsible for the “high” associated with cannabis — are strongly linked to serious mental health risks.
In Europe, cannabis remains largely illegal, but the European Union Drugs Agency (EUDA) estimates that 4.3 million people use the drug daily or nearly every day. Consumption spans smoking herbal marijuana, eating edibles such as gummies, and vaping potent concentrates like hash oil, “shatter,” and “dabs.”
The potency of these products has increased sharply in recent years. In 2023, cannabis resin in Europe had an average THC concentration of 23%, compared with 11% for herbal cannabis, according to the EUDA. By comparison, researchers considered products with THC levels above 10% or 5 milligrams per serving to be “high-potency.”
The review found that people using such products faced an elevated risk of psychosis and schizophrenia within hours of consumption. Long-term use was also tied to cannabis use disorder — a form of addiction — as well as respiratory problems and dependency symptoms.
“There’s a real warning in these findings,” said Dr. Jonathan Samet, a co-author of the study and professor of epidemiology at the Colorado School of Public Health. “We really need to be carefully watching what the consequences of these products are.”
Findings for more common mental health conditions, such as anxiety and depression, were mixed. Some evidence suggested high-potency THC could ease symptoms in patients with cancer or neurological disorders, but other studies identified harmful effects. Overall, researchers cautioned that the benefits were limited and often tied to specific medical conditions.
The EUDA has long warned that frequent and heavy cannabis use can exacerbate psychiatric problems, increase dependence, and worsen lung health. The new findings, while not yet definitive, reinforce these concerns and could influence future regulations.
Samet noted that any attempt to regulate THC levels would face challenges, since consumers could simply adjust their dosage. “There’s not a simple solution when it comes to potency,” he said. Still, he argued that greater awareness is essential, especially for those with existing mental health vulnerabilities.
“People who say, ‘Well, I’m using THC, what about it?’ … need to know that there are risks,” Samet added.
Health
World Cup Emotion Can Strain the Heart, Cardiologists Warn Fans at Risk
As the World Cup begins, medical experts are cautioning football fans with underlying heart conditions that the emotional intensity of matches can place unexpected strain on the cardiovascular system.
Cardiologists say that the excitement, tension, and anxiety generated during high-stakes games can trigger physical reactions similar to intense exercise, raising heart rate, blood pressure, and stress hormones.
“Intense emotions, whether positive or negative, can act as ‘precipitating risk factors’ for cardiovascular events such as heart attack,” said Paola Santalucia, a cardiologist and board member of the European Heart Network.
She explained that moments of extreme excitement, such as a decisive penalty shootout or a last-minute goal, may pose risks for people already living with heart disease. Those with additional risk factors, including hypertension, obesity, or smoking habits, are also advised to be cautious during emotionally charged matches.
Research using wearable devices has shown that during major football events, some fans experience heart rates climbing as high as 150 beats per minute. That level is comparable to sprinting and reflects how strongly the body reacts to emotional stress.
A study examining supporters during the 2025 German Cup final found that even watching from home can significantly affect physiological responses. “They still had an increase in heart rate that compares to walking, even though they didn’t walk,” said Christian Deutscher, professor of sports economics at Bielefeld University and co-author of the study.
He noted that the most intense reactions often occur not during goals themselves, but during moments of uncertainty such as VAR checks, penalty shootouts, or shots striking the post. These unpredictable situations, he said, are what drive the strongest emotional and physical responses among fans.
Deutscher also pointed out that stadium spectators may experience even greater strain due to environmental factors such as heat and alcohol consumption.
However, experts emphasize that football itself is not inherently dangerous. Instead, it is the body’s natural response to excitement that can create temporary stress.
“The adrenergic stimulation is at its max: extreme high blood pressure, high heart rate, and adrenaline, cortisol, skyrocketing,” said Dan Atar, professor of cardiology at Oslo University Hospital. In rare cases, he added, this surge can contribute to the rupture of arterial plaque in vulnerable individuals, potentially leading to a heart attack.
Atar stressed that such events can occur in everyday situations as well, including physical exertion like shoveling snow. “It is in no way dangerous to watch a football game,” he said. “All this is physiologic. It’s not dangerous to be excited.”
Still, he acknowledged that combining emotional stress with alcohol, heat, and pre-existing conditions can increase risk for some viewers.
Doctors advise those at higher risk to continue prescribed medications, limit alcohol intake, avoid smoking, and watch for warning signs such as chest pain or irregular heartbeat.
“The key message is not to avoid enjoying the match, but to do so with moderation and awareness,” Santalucia said.
Health
AI Models Show Ability to Mimic Human Emotions, Offering New Pathways for Mental Health Research
Health
AI Saves Clinicians Weeks of Work but Health Systems Struggle to Keep Up, Philips Report Finds
-
Entertainment2 years agoMeta Acquires Tilda Swinton VR Doc ‘Impulse: Playing With Reality’
-
Sports2 years agoChina’s Historic Olympic Victory Sparks National Pride Amid Controversy
-
Business2 years agoSaudi Arabia’s Model for Sustainable Aviation Practices
-
Business2 years agoRecent Developments in Small Business Taxes
-
Home Improvement2 years agoEffective Drain Cleaning: A Key to a Healthy Plumbing System
-
Politics2 years agoWho was Ebrahim Raisi and his status in Iranian Politics?
-
Sports2 years agoKeely Hodgkinson Wins Britain’s First Athletics Gold at Paris Olympics in 800m
-
Business2 years agoCarrectly: Revolutionizing Car Care in Chicago
