Here's a related explanation by Ivan Pavlov, a Russian physiologist who studied changes in behavior in the early 1900s. One of his observations were that dogs normally salivate just as they are given food. In one of his experiments, he rang a bell just before he fed his dogs. Subsequently, the dogs began to associate and link the sound of the bell with food. Soon, they salivated even if he rang the bell without giving them any food. The dogs had learned “The bell rings means I’m going to be fed!”. Pavlov describes this phenomenon as "a conditioned response".
The same "conditioned response" or association, the term we prefer to use, occurs with you and smoking. After smoking many, many cigarettes, your daily routine and acts become associated with smoking and triggers the urge to smoke. For example, if you smoke every time you drive, just getting into the car can activate associations to smoke, as if your brain tells you, “I’m in the car now so its time to smoke!”
Similarly, if you smoke immediately after you wake up each morning, you mind associates smoking with waking up from sleep. Even long after you’ve quit smoking, you may still get triggers to smoke when you wake up.
Understanding and dealing with these powerful associations is one of the most important part of quitting smoking.
A similar study by B.F. Skinner included a series of animal experiments to study how habits are formed. Skinner found that when behavior, good or bad, is rewarded, it is more likely to be repeated and when punished, it is less likely to be repeated.
Just as in Skinner's research, smokers believe that smoking rewards by relaxing and soothing them. In addition, the close company of other smokers may also lead them to believe that smoking rewards them with social acceptance. Of course, there is no proof to these false perceptions. Still, smokers continue to smoke because they believe smoking rewards them somehow.
At the same time, smokers who try to quit smoking receive "punishment" through bad moods, irresistible urges and cravings. It is no wonder why smokers find it difficult to even consider quitting smoking.
**References
Human Psychopharmacology Volume 11
Journal of Drug Issues 31(2)
BBC Homepage
Your Medical Resource
The Quit Smoking Company
Men Health Magazine Online
