Open University of Catalonia (UOC)

Various studies have shown that smokers have a lower risk of developing Parkinson’s disease, but the causes remain unknown. A study has analysed the role played by carbon monoxide — a toxic gas produced by the combustion of tobacco — in this association. To this end, the team conducted a twelve-year follow-up study of more than half a million adults in China. The results show that regular smoking was associated with an increased risk of lung cancer, ischaemic heart disease, stroke and all-cause mortality, but with a lower risk of Parkinson’s disease. Most strikingly, amongst people who had never smoked, higher levels of exhaled carbon monoxide—which the authors measured—were associated with a lower risk of Parkinson’s disease. According to the study, published in JAMA Neurology, these findings demonstrate a possible protective role of carbon monoxide in the disease, rather than smoking itself.

The artificial intelligence (AI) company OpenAI has unveiled GPT-6 Astra, “the world’s smartest and best-aligned model”, according to the company. The new model will use a technique known as ‘opaque recurrence’, which allows it to operate outside the sequential thinking of most reasoning models and which is causing concern amongst AI safety experts due to the possibility that the model’s thought process may be more difficult to monitor.

On Tuesday, the Council of Ministers approved the draft bill amending the current Tobacco Act, which was passed in 2005. The bill now begins its passage through Parliament and includes new measures to tackle smoking and regulate tobacco-related products. The text prohibits the consumption of tobacco by minors — in addition to its sale —, extends smoke-free zones to outdoor seating areas and other spaces, and restricts the advertising of tobacco-related products. It also treats e-cigarettes and other devices in the same way as traditional tobacco cigarettes, amongst other measures.

A team from the University of California (USA) has published an article questioning the scientific evidence supporting bans on social media for teenagers. Among other reasons, they argue that studies conducted to date on restricting social media use have focused on adults. Furthermore, as one of the authors points out in a press release, these restriction experiments "show weak, negligible, and mixed effects, with 40% of experimental studies reporting harmful effects (e.g., lower life satisfaction and increased loneliness) or no effect from social media restrictions." Some of the authors, whose article is published in Frontiers in Developmental Psychology, declare having ties to companies in the social media industry.

A study published in Nature estimates that more than 10 million children in countries across East and Southern Africa and Southeast Asia have experienced at least one form of online sexual exploitation and abuse, including harassment, the sharing of images without consent, and blackmail. This means that one in six children who use the internet is affected. The analysis is based on data from nearly 12,000 children aged 12 to 17 in 12 countries across Africa and Asia collected between 2020 and 2021, and warns that the actual number could be higher, as many of these incidents went unreported. When they did report incidents, minors primarily turned to informal channels, especially friends, rather than formal reporting mechanisms such as the police or helplines.

Using Ireland as a case study, a new article published in the *Journal of Behavioral Addictions* has analyzed gambling advertisements, taking into account segmentation by gender and age group, as well as the actual reach of the ads. The team included 411 ads from 88 operators that ran between January and February 2025. The data was extracted from the Meta Ad Library, a database of advertising on Meta-owned platforms such as Facebook, Instagram, and Messenger. The total number of ads reached 2.3 times more men than women, and the most exposed age group was 25 to 34 years old. Twenty-two percent of the ads targeted men exclusively; none were aimed solely at women. 

A team from Australia has conducted a review of various types of studies on e-cigarettes from 2017 to 2025. Their conclusion is that e-cigarettes containing nicotine are likely carcinogenic to humans and will cause an as-yet-undetermined number of cases of mouth and lung cancer. In a press release, the authors, who published their findings in the journal Carcinogenesis, state that “the conclusion is unequivocal, although it will take decades for human studies estimating the risk to accumulate.”

A study conducted in South Korea collected data from more than 410,000 smokers over an average of nine years. The analyses indicate that the risk of developing Parkinson's disease in those who quit smoking during that period was about 60% higher than in those who continued to smoke; however, their risk of death was lower. According to the researchers, who emphasise that the study does not prove that smoking prevents Parkinson's disease, smoking ‘remains one of the leading causes of preventable death and contributes to the development of heart disease, cancer and chronic lung disease. The health benefits of quitting smoking remain substantial and clear.’ The results are published in Neurology.

Speaking to the media in Barcelona, the Minister for Social Rights, Consumer Affairs and the 2030 Agenda, Pablo Bustinduy, announced that the ministry will ban the sale of energy drinks to minors under the age of 16 in Spain. The regulation will also apply to minors under the age of 18 when the drinks contain more than 32 milligrams of caffeine per 100 millilitres.