Propylene glycol (PG), as many of you know, is one of the key ingredients of e-liquid.
What you may not know is that in 1942 a Dr. Robertson studied the effect that PG has when dispersed into the air (breathing format). Have you ever heard of the phenomenon about e-cigarette users claiming to never get sick or catch the flu?
Well, there's actually some truth in that.
Dr. Robertson vaporized PG and sprayed it into a chamber of mice. He then took the influenza virus and sprayed that into the chamber. The mice lived.
He then performed the experiment again, this time he sprayed only the influenza virus into the chamber and they all died.
The team of researchers went on to study the data collected and found that propylene glycol, when mixed into the air at a ratio of 1:2,000,000 - the PG acted as a germicide.
The solution would kill the airborne bacteria within a few seconds.
So, next time you try to explain to a colleague or friend that you haven't caught a cold or flu since you started vaping - you can at least explain the science if they don't believe you!