There is research showing dementia side effect of some common inhalers such as Spiriva and Spielto Respimat.
The problem seems to be their anticholinergic properties, affecting pathways to the brain, a problem I understand to be also the case with Warfarin.
GPsand physios are still recommending their use but I am seeking specialist opinion. Better breathless than demented in my view if there is a real risk.