It may just be a pet peeve, but it rankles me a bit when the term "epidemic" is used to describe widespread conditions that are not communicable/infectuous. Looking at the dictionary it appears the usage here is legitimate, but my guess would be that it is a misuse that has become accepted, like using the term "begging the question" to mean suggesting the question.
A dictionary of medicine from 1882 suggests that common usage of the word has become more narrow, not less, and that there was some level of debate about the technical meaning [1]. Stedman's Medical Dictionary (1920) gives a more modern definition, "a disease attacking nearly simultaneously a large number of people", without restriction to infectious diseases.
[1] https://www.google.co.uk/books/edition/A_Dictionary_of_Medic...