Despite everything that is said about nicotine, the dependence it creates is physical, not psychological.
Nicotine causes chemical and biological changes in the brain. Those are the psychoactive effects and, although less dramatic than those of heroin and cocaine, their addictive power is just as high. Nicotine is a reinforcement drug, and users will continue smoking more and more despite its damaging effects. For example, in a research conducted in 1994, only 50% of smokers who suffered from a heart attack and whom doctors had advised to quit did so. Incidentally, 50% of all regulars died from the consequences of tobacco smoking.
Since nicotine addiction is a physical dependence, withdrawal symptoms are severe. Most smokers are unable to quit after their first attempt, due to the gravity of those symptoms. Read More