Why people smoke cigarettes?

It can be traced to the universal desire for self-expression. None of us ever completely outgrows his childhood. We are constantly hunting for the carefree enjoyment we knew as children. As we grew older, we had to subordinate our pleasures to work and to the necessity for unceasing effort. Smoking, for many of us, then, became a substitute for our early habit of following the whims of the moment; it becomes a legitimate excuse for interrupting work and snatching a moment of pleasure. "You sometimes get tired of working intensely," said an accountant whom we interviewed, "and if you sit back for the length of a cigarette, you feel much fresher afterwards. It's a peculiar thing, but I wouldn't think of just sitting back without cigarettes. I guess a cigarette somehow gives me a good excuse."
Most of us are hungry for rewards. We want to be patted on the back. A cigarette is a reward that we can give ourselves as often as we wish. When we have done anything well, for instance, we can congratulate ourselves with a cigarette, which certifies, in effect, that we have been "good boys." We can promise ourselves: "When I have finished this piece of work, when I have written the last page of my report, I'll deserve a little fun. I'll have a cigarette."
As we have said, to explain the pleasure derived from smoking as taste experience alone, is not sufficient. For one thing, such an explanation leaves out the powerful erotic sensitivity of the oral zone. Oral pleasure is just as fundamental as sexuality and hunger. It functions with full strength from earliest childhood.
A cigarettes not only measures time, but also seems to make time pass more rapidly. That is why waiting periods almost autuomatically stimulate the desire to smoke.