A recent study, published in the Journal of Epidemiology, further validated that fear.
Experts disagree about whether physiological or behavioral changes are to blame.
For his part, Paul Palmer, director of the Palmer Smoking Clinic in Palos Hills, says the key is behavior. That's the traffic pattern. Put something in your mouth. It started with candy and gum, then for a few years we got healthy with carrots. But he says those substitutes keep cravings alive.