Well... https://aeon.co/essays/contagion-poison-trigger-books-have-a...

and: https://archive.org/details/americannervousn00bearuoft/page/... - one note on this, Beard blamed nervous exhaustion on steam power, the periodical press, the telegraph, the sciences, and uh... the mental activity of women... This excerpt for a tl;dr: https://english.web.ox.ac.uk/sites/default/files/english/doc...

For how addiction is defined, google ICD-11, it's: Impaired control over the behavior, the behavior taking increasing priority over other interests and daily activities, and continuation or escalation despite negative consequences, plus distress or functional impairment.. (I'm an alcoholic, 5 years sober)