Now that's a little much isn't it? Does not this Gravity shit consist of 98% Propylene Glyco? Polluted enough for you?
just sayin.... I have kept bud fresh using propylene glycol, and if you read food labels you start to notice it is everywhere.
I'm not saying it's good to chuck propylene glycol at your soil, but I do feel it's a safe preservative for smokables..
I'm just saying there is a bit of an overreaction and a misunderstanding of why it is a problematic pollutant around airports. It's absolutely a question of a relatively harmless product causing problems when overused.