Health
UK Researchers Propose Weekly Limits to Promote Safer Cannabis Use
Researchers in the United Kingdom have proposed new guidelines for safer cannabis consumption, aiming to reduce health risks as the drug becomes increasingly used and available across Europe.
A study conducted by the University of Bath, published in the journal Addiction, recommends a weekly threshold based on tetrahydrocannabinol (THC) content, the psychoactive compound in cannabis. The approach is similar to alcohol intake guidelines, focusing on both potency and quantity rather than solely frequency of use.
“The ultimate goal of our new guidelines is to reduce harm. The only truly safe level of cannabis use is no use,” said Rachel Lees Thorne, lead researcher in Bath’s Department of Psychology. “However, for those who don’t want to stop or are unable to, we still want to make it easier for them to lower their risk of harm.”
The researchers suggest that adults should not exceed eight THC units per week, equivalent to around 40 mg of THC or roughly one-third of a gram of herbal cannabis. Each THC unit corresponds to five milligrams. Tom Freeman, a senior researcher on the Bath team, said that focusing on THC units can help users understand their consumption and make informed choices. He added that public health bodies and healthcare providers could use the thresholds to communicate risks and monitor reductions in use.
The recommendations were informed by data from the CannTeen study at University College London, which followed 150 cannabis users for one year to track weekly THC intake and assess cannabis use disorder (CUD). The Bath team found that the risk of CUD increases above eight THC units per week, with severe cases rising above 13 units. CUD is estimated to affect 22 percent of regular users and can cause cravings, dependence, and disruptions to daily life.
Cannabis use has been linked to physical and mental health problems, including chronic respiratory symptoms, dependence, and psychotic episodes. Risks are higher for early onset use, high-potency products, and long-term consumption patterns.
Freeman emphasized the importance of the guidance as legal markets expand worldwide. “As cannabis becomes increasingly available, it is more important than ever to help consumers make informed choices about their use,” he said.
Cannabis remains the most widely consumed illicit drug in Europe. According to the European Union Drugs Agency, about 8.4 percent of adults aged 15 to 64—roughly 24 million people—used cannabis in the past year, with an estimated 4.3 million using it daily or almost daily.
Cannabis laws across Europe remain strict, though some countries have eased regulations. Malta legalized adult use in 2021, permitting possession of small amounts, home cultivation, and non-profit distribution associations. Luxembourg and Germany allow limited private use and home cultivation, while the Netherlands and Switzerland are piloting controlled sales of flowers, resin, oils, and edibles.
The Bath study’s guidelines aim to provide a clear framework for adults to manage cannabis consumption and reduce associated health risks in a changing European market.
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
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Health
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