Why do some people cough all the time for seemingly no reason?

Lets cut to the chase on this, Caesar Roberto...

Is there someone in your orbit who coughs a lot and its gotten to the point that it annoys you? That's what I think this is. Why not try to talk to that person and find out what's going on? You might realize that he/she is not even aware how offensive they're being. They might even change their behavior after you inquire. If I were you I would inquire in such a way such as to suggest concern for them. Take into consideration that they might have a legitimate problem.

But if you're not having a specific problem, and are just making a general observation about people who cough, and are assuming that they're, how did you put it? "...being obnoxious, annoying jerks on purpose or are ridden with disease?" then I would suggest at least pretending to be mature about it.

Good luck!