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Cigarette smoking is a harmful habit which reduces the expectation of good health and shortens life. Cigarette smokers absorb into the lungs:
1. Nicotine. This is a habit-forming drug with a mild stimulatory effect. It causes construction of small blood vessels and a rise in blood pressure.
2. Carcinogenic tars. These tars isolated from cigarette smoke have been shown to cause cancer in experimental animals.
3. Carbon monoxide. Cigarette smokers have raised blood levels of carboxyhaemoglobin passes through into the fetal circulation.
Закончите предложение:
Nicotine causes construction of small blood vessels and …
a fall in blood pressure
a rise in blood levels
a fall in blood levels
a rise in blood pressure
