Hey Ren. And anybody else with asthma...
My present puffer has propylene glycol in it as propellant, which I'm allergic to- it sets off my asthma

. Net result is zero. Therapeurtic affect is completely offset by aggravating effect. You might try checking out that possibilty. . As I'm finding on the vaping fora (PG is extremely common e-juice ingredient, too) a growing number of people have PG allegy .
I've had a word with my chemist, and it seems they can still dispense the more expensive PG-free version for me (in spite of theg rowing NHS penny-pinching). I'd just better remind them, next time I bring a prescription in, hadn't I?
In the meantime , I've made the happy discovery th\t Loratadine (an H1 antistamine) is highly effective against my asthma attacks! better that the inhaler, indeed. the only snag being that it takes 20 minutes or so to take effect, of course, (I ingest it, via syprup) . Not much of a snag for me, because the main problem with my asthma is that it can go on for weeks or even months if it isn't interrupted (ohhhh! I just thought! that must because it's aspie asthma

)
Any old OTC antihistamine shoukd do the trick , I suppose. But for me, some of 'em, unaccountably, have zero effect , and for the rest...it's insanely difficullt to find a formulation that I don't have bad reatios to (on account of the "inactive" ingredients) . Actually there's PG in the freaking Loratadine syrup, too, but so far, ingesting it has done me no harm.
Anyway, that might be worth a try, if you haven't tried it already.