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
Global Mental Health Cases Near 1.2 Billion as Anxiety and Depression Drive Sharp Worldwide Rise
A major global analysis has found that mental health conditions have surged to an estimated 1.2 billion people worldwide, driven largely by steep increases in anxiety and depression over the past three decades.
The findings, published in The Lancet as part of the Global Burden of Disease Study 2023, show that the number of people living with mental disorders has almost doubled since 1990, marking a 95% rise. Researchers say major depressive disorder and anxiety disorders have seen even sharper growth, increasing by 131% and 158% respectively, making them the most prevalent mental health conditions globally.
The report describes mental illnesses as widespread conditions that create long-term disability and significant human suffering. It also highlights broader consequences for economies and public services, including reduced productivity, lower workforce participation and increasing pressure on health and welfare systems.
Researchers estimate that in 2023 alone, around 620 million females and 552 million males were affected by mental health conditions. While the overall burden is rising across both sexes, the study points to notable differences in the types and prevalence of disorders.
Among women, depression and anxiety were the most commonly reported conditions, alongside higher rates of eating disorders such as anorexia nervosa and bulimia nervosa. The report links this disparity to a mix of biological, social and structural factors, including exposure to domestic violence, sexual abuse, gender inequality and reproductive health-related changes.
In contrast, neurodevelopmental and behavioural disorders, including attention deficit hyperactivity disorder (ADHD), conduct disorder and autism spectrum conditions, were more frequently diagnosed in men.
Teenagers aged 15 to 19 were identified as the group experiencing the highest mental health burden globally, raising concerns about early onset of conditions and insufficient preventive care for young people.
The study identifies several key risk factors associated with mental illness, including childhood sexual violence, bullying and intimate partner violence. These factors are strongly linked to conditions such as depression, schizophrenia, bipolar disorder and anxiety disorders. However, researchers note that such exposures have remained relatively stable over time and account for only a portion of the overall rise.
According to the authors, broader drivers are likely contributing to the increasing prevalence of mental disorders. These include genetic and biological influences, poverty, inequality, and the growing impact of global crises such as armed conflict, pandemics, natural disasters and climate-related stress.
While mental health conditions have long been a leading cause of disability worldwide, the report warns that the situation is worsening. At the same time, health systems have not expanded services at a pace matching demand.
The authors caution that the gap between rising need and limited access to care is becoming more pronounced, leaving millions without adequate treatment or support.
Health
Europe Records Sharp Rise in Sexually Transmitted Infections, ECDC Warns
Health
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