You can measure the correlation all you want, but to prove causation you have to be able to control the source (creteris paribus).
It's hard to get a study approved that intents to expose subjects to something you know is harmful.(?)
With sigarettes, researcher could just prove the material harm, and conclude causation, but proving purely psychological harm seems hard to prove
nb it's ceteris, same root used in et cetera.
You can measure the correlation all you want, but to prove causation you have to be able to control the source (creteris paribus).
It's hard to get a study approved that intents to expose subjects to something you know is harmful.(?)
With sigarettes, researcher could just prove the material harm, and conclude causation, but proving purely psychological harm seems hard to prove