According to the passage, cigarette can do harm to all the following EXCEFF（）

A．male smokers smoke more than female ones
B．male smokers are more likely to be affected by smoking
C．male smokers breath in the smoke deeper than female ones
D．male smokers are more likely to be affected by other factors in envionment

A．offer advice on how to give up smoking
B．explain the influence of cigarette smoking on health
C．list the factors that can cause cancer
D．compare the opinions on the effect of smoking