Medicine: Cigarettes & Cancer (Cont.)

A committee of Britain's top cancer specialists has taken a long, hard look at the connection between smoking and lung cancer, Health Minister Iain MacLeod told Parliament last week, and has reached these conclusions:

¶ The relationship is "established," and there is "a strong presumption" that it is a matter of cause and effect.

¶ It is not a simple relationship, because no factor that causes cancer of the lung has yet been found in tobacco tar, and some of the increase in lung cancer is probably due to other things, such as atmospheric pollution.

¶ The death rate would not drop dramatically if...