Students repeat the word twice with you, copying your body language. Students recite all three diseases in order, using the three pronunciations they practiced. Demonstrate effects of tobacco use. It doesn't take years for smoking to affect the heart and circulatory system. Nicotine raises the heart rate 10-15 beats per minute immediately, so the body is now working harder, even though many smokers claim cigarettes relax them.
Nicotine first stimulates the brain, then causes a letdown.
The smoker then needs additional nicotine just to feel normal. Nicotine is a vasoconstrictor-it narrows blood vessels. Lung tissue consists of layer upon layer of spongy, elastic tissue. If all the layers of the lung were spread side by side, they would cover half a basketball court. Then the smoker can no longer exhale without effort.