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Exposure to secondhand aerosol from electronic cigarettes (e-cigarettes) may pose harms to bystanders, but they are used in many indoor settings. Less evidence exists on e-cigarette use in outdoor settings. This study aims to assess the use of e-cigarettes in outdoor settings in Europe. A cross-sectional study was conducted at the entrances of primary schools (N = 20, children's playgrounds (N = 20, and outdoor hospitality venues (N = 22 during 2017-2018 in major cities of 11 European countries. We performed 30-min observations an