I really don't think so. I have a cold at the moment, but unlike every other cold I've had for the last 40 yrs, this one is not involving my lungs WHATSOEVER -- just making my sinuses feel raw, my throat a bit scratchy, headache. I'm vaping some Pineapple with Koolada in it, and the coolness is nice on my throat and in my sinuses.
I've heard that PG actually is antibacterial; don't know if it has the same effect on virii, but I know this is by FAR the mildest cold I've had in 40 yrs. I had a cold back in January, right before and at the very start of when I started vaping, and with that cold, after I'd had it for about 2 days, I sounded like I needed to be in the tubercular ward -- not this time at all! My lungs are completely clear -- good news for an asthmatic at any time, but when I have a cold? Nearly miraculous.
Andria