Urban myth but for non-myths [duplicate]

What's some slang for "common public belief" that doesn't have any implications about the truthfulness of the belief?

Similar to "common sense", but I'm looking for a phrase that has more "urban myth" flavour. Not some rationale intrinsic to every human (as common sense might imply), but more so spread by word of mouth or such around the population and established collectively. The word should have the same feeling as "broscience", but not be about the gym specifically.

Street-smarts or street wisdom come to mind, but I haven't found them to be established terms for this. Street-smarts especially seems to have a different meaning, about dealing with danger.

_____ is that being cold weakens your immune system and makes you more susceptible to catching illness

_____ would see you running the other way as soon as ..., but actually....

Conventional wisdom is perhaps the best phrase. Merriam-Webster defines it as "the generally accepted belief, opinion, judgment, or prediction about a particular matter" with the example "Conventional wisdom in Hollywood says that a movie can't succeed unless it stars a famous actor or actress." It has a sense of being what is generally or universally believed, and generally with a certain element of truth, although perhaps without scientific rigor or formal proof.

There are many phrases such as folk wisdom, old wives tales, urban myths, all of which more or less imply something is untrue or at minimum believed for little or no reason. But the OP asks for a term "that doesn't have any implications about the truthfulness of the belief".