Thoughts on rhetoric

Basically my understanding of rhetoric's is that rhetoric’s is means of conveying the message in a nice way, and then dialectic thought is used for analyzing the message that was conveyed to decide if it is a true or a false rhetoric. In our day rhetorics regarded by many as something negative because it is a very effective way to lie if a person listening is not really analyzing what you are saying. Using rhetoric makes something "sound true" even though it doesnt necesseraly have to be true. But on the other hand rhetorics or the art of speech is used everyday by any good salesmen and buisness men. An excellent example of a man who is very good at rhetorical speaches is the movie "Thank you for smoking". This movie is about a man who is a speaker for the cigarette companies. He is one of the best, as cigarettes are a hard product to sell, advertise and most of all defend in public against all the health critics. My favourite quote from this movie and goes something like " it doesnt matter what you are trying to prove, as long as you construct your argument correctly you are going to be right." and this is displayed throughout the movie how he defends cigarettes by telling people how its in their librety to smoke, and it is their decission, cigarette companies are only there to provide a service. Anyways I dont want to give away too much detail, because it is a very interesting movie to watch, and it relates alot to rhetoric's.