Lol, this is the Allen Carr school of thought; that it only relieves a stress you created by starting to smoke in the first place It's a chicken and egg thing.It does make some sense. It's an addiction, so if you don't get your fix you'll get withdrawal symptoms. When you smoke again after a while the symptoms will be relieved and you'll feel better. And that could be interpreted as a relieve of stress.
His philosophy makes perfect sense to me. I didn't even want to quit, but felt stupid still smoking after I read what he had to say. I no longer consider myself an addictive person anyway, but I never had a shred of trouble quitting the fags.
My father, on the other hand, read the entire thing, nodding thoughtfully... whilst puffing on a roll up or 60 (no prizes for guessing what he died of)!