Got links? Never heard of PG contributing to asthma...
That said, even though PG is not commonly used in asthma inhalers anymore in this country (it's still used overseas, I believe), it is used currently in Johnson & Johnson's Nicorette QuickMist.
NICORETTE® | NICORETTE® QuickMist | NICORETTE® products | Stop smoking | NICORETTE® AU
List of ingredients:
Propylene glycol
Anhydrous ethanol
Trometamol
Poloxamer 407
Glycerol
Sodium hydrogen carbonate
Levomenthol
Mint flavour
Cooling flavour
Sucralose
Acesulfame potassium
Hydrochloric acid
Purified water
hmmmm interesting