Aversion therapy relied on the theory that creating unpleasant associations about cigs (in the mind/body of the smoker) would discourage smoking. This approach was popular several decades ago, but hasn't proven to be any more effective than other cognitive-behavioral quit-methods. Some aversion-therapy-like tricks can be effective, however. An ex-smoker sent in this idea for dealing with the occasional urge for a cigarette: Dump butts from several ashtrays into a medium sized jar and fill it halfway with water; as it soaks, this water will get nearly black. Keep this jar in a place where you can see it frequently. Think about how your smoke-filled lungs resemble that jar! When an urge to smoke arrives you can go to your jar, open it, and take a good whiff. This may help you to be happy that you finally got free of this addiction, and may help you to be clear in your decision not to smoke.