It is believed that the habit - is a form of human behavior. There are both positive habits and bad habits lead to useful personal development, and harmful, contrary to its destruction. It is important to know that the habit is a thing stiyka.Studentam particular care must be taken to ensure that there were close only positive habits. Useful habits can be hard, strive to learn new things and learn as much as possible, striving to exercise, the desire for cultural leisure, such as visiting the theater, reading knyh.Vsi these classes gradually enriching human knowledge, he becomes curious and starts to cultivate. But despite all this purity of the students there and bad habits. It whipped diet, irregular sleep and omissions in the classroom or homework. The most harmful habit is, of course, smoking and drinking alcoholic beverages. Habits can easily turn into a vice and ruin future life lyudyni.Likari reminded that the risk of cardiovascular diseases there is smoking. A harmful effect of cigarette provides nicotine. If suppose a young student smokes a cigarette its vessels dilate and thus he can feel that it improves performance, but not at dovho.Ale after which, the period of reduced mental capacity again and there again the need for a cigarette. Also for men Smoking is not very positive, because if you smoke for a long time, this leads to poor performance secretion. Increasingly, adrenaline is released into the blood, increases blood pressure, which leads to disruption of the heartbeat.