I too learned to lie growing up. My parents both grew up poor. My father can be pretty controlling. He's never been abusive, but he's definitely a control freak, especially about money, knowing the true value of a dollar. My mother is exactly the opposite. When she has money, she thinks it should be spent. At the beginning of their marriage, my father actually took my mother's checkbook away from her and put her on an allowance because he couldn't trust her with the finances. By the time I came along, that has passed, but my mother still shops and then hides the bags in the car, only bringing one or two in every once in a while. That taught me that "little white lies" aren't that big a deal, except that they are.
As I said in my original post, there wasn't one big AH-HA moment for me. I think I just grew up through all the discussions, fights, all the aftermath of d-day. I just don't think this is something that you can teach a person; they either get it...or not. I see a lot written here about hitting rock bottom before being able to dig out, and I think this applies to lying just as much as any other self-destructive behavior.
Like many things, lying, I think, can be a bad habit or maybe even an addiction. It's something a "user" has to make a conscious choice not to do.