Prof Lion Shahab, Professor of Health Psychology [...] “This paper reports on the potential impact of secondhand nicotine vape exposure in young adults on respiratory symptoms. After controlling for various potential confounders such as young adult’s own use of cigarettes, e-cigarettes or cannabis as well as secondhand exposure to cigarette or cannabis smoke, young adults who were exposed to secondhand nicotine vaping were more likely to report respiratory symptoms than those who were not. While this finding is worrying and deserves further investigation, the results should be seen in context of the limitations of this study. [...]