I think it's hilarious when they say that vapor "may cause asthma".... When I was first diagnosed with adult-onset asthma almost 30 yrs ago, of course that was one of my first questions to the doc: "what causes it?" And get this: THEY DON'T KNOW WHAT CAUSES ASTHMA. Best they can come up with is a) genetic tendency; if one parent has or ever had asthma, a child has a 25% chance of also having or developing asthma; if both parents, a 50% chance of having or developing it; b) some chemical exposure (to a wide range of chemicals, but different for every person), or other causes such as stress, weeping, laughing, etc, may bring on "asthmatic symptoms" -- which is NOT the same as "having or developing asthma;" it just means that something irritated your bronchioles and made them constrict, which causes "tightness" and wheezing.
If a person ACTUALLY HAS BRONCHIAL ASTHMA, then any exposure to any "sulfiting agent" WILL bring on an asthma attack, or potentially even complete pulmonary collapse. But there are no 'sulfiting agents' in ejuice. Because propylene glycol (PG) *can* be irritating, it can potentially cause "asthmatic symptoms," but again, that is NOT the same as "having or developing asthma."
Andria