Jargon is everywhere. You know–the special, “inside” language that is used by specific industries or groups of people but is completely obscure to Joe Public. (Have you ever tried to read a legal brief? Or a medical journal?) Referring to an addressed envelope as a SASE. Calling the newsperson in front of the camera the Talent. Saying a project given a go-ahead is Green-Lighted. Calling a piece of undeliverable mail a Nixie.
The thing you need to be aware of is that jargon, by its very nature, puts a wall between you and everybody else. You might know exactly what you mean when you say your company was “down-sized,” but will everybody? Are you deliberately using it to obfuscate your meaning? Or, is your meaning confusing because you assume that everyone you’re talking to will be familiar with the jargon? If you’re trying to be obscure, or if you’re gearing your writing to a very specific set of people who have their own, very specific way of speaking (lawyers, computer geeks, photographers, rap stars), jargon may be fine.
But be wary. If you aren’t careful, your use of jargon could impede the transference of data segments to the mental computational devices of the written-word scanner.
(In other words, jargon may interfere with your information getting into your reader’s brain.)