Public
Many sources report an association. Calling that association a cause is a separate step, and the source may not have taken it. In 1965 Bradford Hill listed questions to ask before treating an association as causal. They include how strong it is, whether it repeats across different studies, and which came first. One of his examples was diet: does a diet cause a disease, or do people with the disease choose that diet? When a note says "causes", check whether its source says so or only reports that the two go together.
