Smokers tend to have cravings, it is mainly the result of long-term effects of nicotine. Nicotine, like other anesthetics, started smoking when not adapt, can cause chest tightness, nausea, dizziness and other symptoms, but if smoking a long time, the nicotine in the blood reaches a certain concentration, repeated stimulation of the brain and to the organs. dependence on nicotine, smoking on the ridden a time. If you stop smoking, will be temporary irritability, insomnia, anorexia and other so-called "withdrawal symptoms" and the fact that smokers of tobacco to produce a psychological dependence, that smoking can be refreshing, boredom, fatigue, etc., so more and more smokers, unable to stop.
In fact, tobacco and heroin addiction caused by the different, the former is entirely possible to quit, and the key to kick the psychological dependence on tobacco. This psychological dependence leading to an act dependent smokers, smokers find quitting difficult to make a great, potentially increasing the difficulty of quitting.
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