I guess just some of the inconclusive stuff Ive been reading on PG is bothering me, and I know that coloring is bad. But don't get me wrong, I do love the vapor and flavors! It's just that no one mentions that PG is also used in antifreeze and is a food preservative meant to be used in small amounts. Being used in asthma inhalers is somewhat reassuring, but how is that vapor there? Is it vaporized in a similar fashion and then compressed? It's not like there's an atomizer in inhalers.