https://www.health24.com/Medical/Flu/News/vaping-habit-might-make-you-more-prone-to-flu-20 Disrupting immune response "We know that cigarette smoking increases your risk of infection with influenza, and we were curious whether e-cigarettes would also disrupt the normal immune response," Rebuli said. The study included nearly 50 people – 14 e-cigarette users, 13 tobacco cigarette smokers and 20 non-smokers. On average, participants were slightly overweight and in their mid to late 20s. But the e-cigarette vapers were slightly younger, with an average age of 23. E-cigarettes do affect immune system All of the volunteers were exposed to a "live attenuated influenza virus". Rebuli said this particular virus only replicates in the nose. When the investigators looked at how the immune system responded to the virus, they saw differences in e-cigarette and regular cigarette smokers compared to the non-smokers. But the changes differed depending on the method of smoking. Rebuli said it's not clear exactly how e-cigarettes led to the changes in the immune response, just that they did. And while the researchers didn't look at whether or not a flu infection might be more severe in people who use e-cigarettes, "it's a possibility," she said. They didn't look if the flu is worse if you vape but anythings possible so that's what the headline will be. Seriously? The study was with 50 people. only 14 vapers Couldn't be that genetics may have something to do with it? I don't know about you guys but there have been some severely nasty flu seasons where I live and I have never caught the flu as a vaper.