SUGGESTED ANSWER TO QUESTION 1-1(e)

Nicotine is highly addictive and, when heavy smokers stop for even a short time, they begin to feel strong cravings for the drug. Jason smoked three packs of cigarettes a day for 10 years. Last month, he quit. He has had no desire to smoke since then.

In the following, two possible explanations are mentioned. You may have thought of other possibilities.

Again, there are individual differences in the effects of drugs. In this case, it could be that Jason did not become physically or psychologically dependent on nicotine because of something unusual about his physiology (see Chapter 5 for a discussion of drug dependence). Another possibility is that he is getting his nicotine in some other way, such as by chewing tobacco.