email article In a web-based survey involving more than 2,900 teens and young adults, electronic cigarette use was associated with shortness of breath and other respiratory events, even among those who did not smoke combustible cigarettes or use marijuana. After controlling for demographic characteristics and multi-product use, past 30-day e-cigarette use was associated with an increased odds of self-reported wheezing and shortness of breath, reported Alayna Tackett, PhD, of the Keck School of Medicine at the University of Southern California in Los Angeles, at the American Thoracic Society (ATS) virtual meeting. Tackett told MedPage Today that previous observational studies have shown associations between e-cigarette, combustible cigarette, and marijuana use and respiratory symptoms, such as asthma, wheeze, and shortness of breath. But many did not attempt to tease out the impact of concurrent combustible cigarette and/or marijuana use in e-cigarette users.