My concern is that here in the US inhalers can get pricey- about five years ago the out-of-pocket was $70 for a 200-count MDI, and there was no generic available because of the propellant change since that was still under patent. They're a bit cheaper now that generics are available (some are even available over the counter), but another propellant change without a price cap or free use of the patent for inhalers is going to cause significant distress- and take rescue MDIs off the non-script shelves again.

What's fun is that worsening air pollution tends to cause asthma, so we could find ourselves in a worse situation than we did a year into Covid: a boost to the population seeking treatment for breathing issues, with an added twist of a sudden drop in available and reasonably priced inhalers.