time when the user is high they will have an increased heart rate50% above normal. The amount the heart rate increases depends on the amount of marijuana that was smoked. (Mathew, RJ) This will make exercise and other activities seem a lot harder. The effect could be extremely dangerous for a person with a congestive heart or with an irregular heartbeat. A chronic smoker will have a decreased heart rate, often below normal. The immediate effect of smoking marijuana on the lungs is a brief opening of the bronchial tubes. That is why marijuana has been tested for possible medical uses. (Wyander, Ernst) It was not approved because there is a rebound reaction, which closes up the user's airways. Marijuana also irritates lung tissue. The long-term effect of smoking marijuana regularly is close to the effects of a tobacco cigarette smoker, but marijuana is more damaging to the lungs than cigarettes. Though the amount of tobacco consumed by the cigarette smoker is a lot higher than the amount of marijuana a chronic smoker will inhale, the harmful ingredients in marijuana are a lot higher than the amount in tobacco, causing a similar effect on the lungs. (The Book of Health) Marijuana smoke in the lungs will kill cilia. Cilia moves mucous, dirt and other particles out of the lungs. Also the, heavy usage will decrease your lung's defense against bacterial and fungal infections. It does significant damage to the immune system, and it cans causes early onset of cancer of the head, neck, esophogus, and lungs. The damage to the immune system can cause the user to get pneumonia or a chest cold etc. more easily. (Jaffe, Jerome H) Marijuana is very harmful yet very widespread. It causes structural damages in brain cells, and has been found to cause brain damage, mental illness, memory impairment and behavioral abnormalities. It is an illegal drug that can harm almost every vital part of your body. It can make your memory vanish and ...