单项选择题

Which of the following statements is NOT true according to the passage

A．Quite a big percentage of Americans are cigarette smokers.
B．Americans are well informed of the danger from smoking.
C．Smokers of cigarettes may die of cancer.
D．The campaign against smoking succeeds in preventing Americans from smoking.

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单项选择题The author seems to consider it to be ______ for those Swedish smokers to switch to smokeless tobacco.

A．valuable
B．pointless
C．useless
D．irrational