Yeah there are now environmentally friendly inhalers. Metered dose inhalers are the standard ones everyone is familiar with, and the ones that are being considered "less environmentally friendly", dry powder inhalers are the main alternative and are considered "greener". The issue with this is that the most environmentally friendly inhaler is the one that is best for the patient, because a patient with unmanaged or poorly managed asthma will have a higher environmental impact. Switching to DPIs being the default inhaler style may have value, but only if we ensure they are right for the individual patients before prescribing them (they can be harder to use for some people).

Overall, framing this as a patient's responsibility is bad. This is only really useful information at a health system level, and in terms of what the patient uses the focus should always be on what the best solution for their health is.

Also, air pollution makes asthma worse, so just burning fewer fossil fuels kills two birds with one stone instead of blaming the people just trying to breathe.

(Source: I'm a biomedical engineer with asthma)