A

 As an important part of their anti－smoking movement (禁烟运动) activitists(积极分子) have been struggling to have the warning “Smoking is harmful to health” printed on all Chinamade packs of cigarettes．

 Although words of caution (警告) do appear on many packs, smokers seem to turn a blind eye to them． A recent survey (调查) shows that 90 percent of Chinese smokers pick up the bad habit before they are 20 years old． The percentage (百分比) of young male smokers has reached 50％ over the past few years．