Apart from statistics, it might be helpful to look at what tobacco does to the human body. Smoke is a mixture of gases, vaporized chemicals, minute particles of ash and other solids. There is also nicotine, which is powerful poison, and black tar. As smoke is breathed in, all those components from deposits on the membranes of the lungs. One point of concentration is where the air tube and bronchus divides. Most lung cancer begins at this point.

　　Filters and low tar tobacco are claimed to make smoking to some extent safer, but they can only slightly reduce, not eliminate the hazards.

　　1. It is easy to determine whether smoking is hazardous.

　　A. Right B.Wrong C. Not mentioned

　　2. Smoking reduces ones life expectancy.

　　A. Right B.Wrong C. Not mentioned

　　3. Smoking may induce lung cancer.

　　A. Right B.Wrong C. Not mentioned

　　4. There is evidence that smoking is responsible for breast cancer.

　　A. Right B.Wrong C. Not mentioned

　　5. Male smokers have a lower death rate from heart disease than female smokers

　　A. Right B.Wrong C. Not mentioned

　　6. Nicotine is poisonous.

　　A. Right B.Wrong C. Not mentioned

　　7. Filters and low tar tobacco make smoking safer.

　　A. Right B.Wrong C. Not mentioned

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