https://xkcd.com/552/ https://xkcd.com/552/ Alt-Text: "Correlation doesn't imply causation, but it does waggle its eyebrows suggestively and gesture furtively

https://xkcd.com/552/ https://xkcd.com/552/ Alt-Text: "Correlation doesn't imply causation, but it does waggle its eyebrows suggestively and gesture furtively while mouthing 'look over there'." I think you could replace correlation with "small studies" or "anecdotes". These are all things that suggest there may be some effect, and there may be merit in further study.