Smoking can sometimes take the place of hunger pangs. Smokers can often feel hungry and may not want to stop to eat so they have a cigarette. The cigarette (similar to drinking water) will make the hunger pang go away for a short time, but, it also can cause stomach trouble. If one doesn't eat when hungry and isn't on a good diet and smokes rather than eats then stomach acids are high and may cause stomach cancer to ulcers and acid reflux. Smoking when hungry also can cause harmful effects on the kidney and liver.
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It would seem so. The pharmaceutical industry is spending a lot of money researching nicotine-based drugs for the treatment of many medical conditions, including obesity.