coughs tickle your throat causing reaction to where you breathe out the tickle
All coughs are symptomatic.
yes it like over dosing on drugs. If you really like the taste of them then Halls makes drops for reasons other that coughs.
Is there any scienctic proof that non narcotic cough syrup help?
you cough to get the mucus out of the tracea (throut)
Simply put, because it sounds like what it is: that's called "onomatopoeic". "Cough" comes from Old English, first recorded in the early 14th century. See the related link below: