Regular physical activity is associated with better lung function among current smokers in European cities, regardless of air pollution levels. This is the main conclusion of a new study comprising over 4,500 people from nine European countries, led by the Barcelona Institute of Global Health (ISGlobal), an institution supported by ”la Caixa” Foundation, and conducted as part of the "Ageing Lungs in European Cohorts" (ALEC) project*, coordinated by Imperial College London.