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Researchers at UNC-Chapel Hill have found that people who use e-cigarettes have significantly altered immune responses to influenza viruses, a worrying discovery as flu season approaches and COVID-19 surges across the U.S. "There's been a lot of questions in the field as to whether e-cigarette and cigarette use is beneficial or damaging or problematic in terms of COVID, and we really haven't had a good answer," Meghan Rebuli, an assistant professor in the UNC Department of Pediatrics, said in an interview.