In some people, the first symptoms of nicotine dependence can appear after just a few weeks of occasional smoking, before they start smoking every day. These symptoms include, for example, a strong urge to smoke, irritability and difficulty concentrating when smoking is not possible, as well as a failed attempt to quit.
An American study followed 679 pupils aged 12 and 13 for 30 months. Of the 332 pupils who used tobacco during that time, 40 percent reported at least one symptom of dependence. Half of the girls with such symptoms noticed them no later than 21 days after they started smoking at least once a month. For boys, this period was 183 days. When the first symptom appeared, participants usually smoked 2 cigarettes on one day a week. Pupils who had even one symptom were much more likely to still be smoking at the end of the study.
Another American study involved 367 teenagers who smoked. Signs of losing control over smoking, such as a failed attempt to quit or a feeling that cigarettes were indispensable, were reported by 9 percent of those who had smoked 2 cigarettes in their lifetime and by 44 percent of those who had smoked 5 to 9 cigarettes. Among those who had smoked at least 100 cigarettes in their lifetime, the figure reached 96 percent.
These results show that dependence is not determined only by the number of cigarettes smoked. That is why, at the appointment, the doctor also asks about nicotine cravings, how the patient feels on days without cigarettes and how previous attempts to quit went. The medicine eases nicotine withdrawal symptoms, and in sessions with an addiction therapist the patient learns to ride out the urge to smoke.