Honey cure cough?

Heard from quite a number of friends that honey can cure cough. The trick is, u need to get pure honey. How to know whether it's pure or not pure? Erm? by price? No not necessary. A friend told me she took a tablespoon of honey when she was in Bangkok and her cough cured. Recently she started to cough again but she tried so many different kinds of expensive honey but the cough doesn't go away.

hmm.. so where can we get the so call pure honey?