Q4 Do lungs become deep-black if smoking is continued truly? A If it is called smoking, the image of a lung cancer will surely hang around. There is a poster which carried the comparison photograph of smoking person's lungs and a non-smoking person's lungs as part of non-smoking campaign. Probably, there is also much seen direction. A non-smoking person's lungs are carrying out beautiful pink. However, as a smoking person's lungs sprayed coal tar, it is a very merciless aspect. If it is smoking to be sure, the phlegm to vomit will be sticky brown and dirty tar will adhere to teeth. The filter of tobacco is also covered with a brown tar. "Of course, my lungs will also be deep-black by the tar." It will be strangely convinced like this. If lungs become full of tars, whenever only that may become a lung cancer, the touch which is not amusing will carry out it. However, that photograph has committed trifling stepping out of the ring unintentionally for promoting prohibition of smoking in fact. Seemingly the photograph of a non-smoking person's lungs may be a photograph of the lungs of the girl killed in accident by environmentization which is not polluted, and gives a nod of assent indeed. If it is the young lungs which were inhaling only beautiful air, of course, it is pink. It is a smoking person's lungs that it is a problem. Those lungs are lungs of the old man who died of polluted environmentization. If air is dirty, regardless of the existence of smoking, lungs will become dirty. Moreover, if a young man is compared with an old man, an old person is unavoidable also in dirty lungs. In short, the photograph of those two lungs cannot carry out comparison contrast. If it compares, they have to present the photograph with which smoking and un-smoking are only different on the same conditions. Although it is clear that lungs become dirty if it smokes, the cause by which lungs become dirty is not only it. The lungs of the people which are having labor forced smoke near,a diesel car driver, or a mine laborer atc. There are some persons who are not smoking among them mostly. Even in such a case, the contamination is progressing as compared with the people with general them. Moreover, the blackness and health of appearance of lungs are not in a proportionality relation directly. A lot of meal cells exist in lungs, and they swallow the contaminant which has invaded in order to protect lung cells. As for the blackness of the appearance of lungs, lungs have not necessarily received the damage directly with a contaminant. It is black as a result of a meal cell's enclosing a contaminant. However, it does not become the reason as which how much black lungs are sufficient. It is because it is more advisable not to be indebted to a meal cell. If it is the lungs of the active young men of cell division, even if they are smoking, it may not be polluted so black. Then, however the person of adolescence may smoke, is he safety? Of course, such a reason cannot be found. Since a cancerous change of normal cells advances regardless of appearance, it is troublesome.