Does dissociation happen in gases?
The information is confusing precisely because your question itself is confusing. There are different kinds of dissociation, and different degrees thereof. Moreover, there are different areas of study, each with its own concepts of what is significant and what is not. For example, if one molecule in a trillion splits into ions, this is nothing for chemistry, but probably quite a something for atmospheric physics.

As for the question you supposedly intended to ask: no, electrolytic dissociation of dissolved substances never happens in gases the way it happens in water.

Also, welcome to Chem.SE.