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Smoking is dangerous to your health!
There is a pattern printed in the filter tip. This material reacts with the nicotine. So the pattern changes while smoking. When the concentration of the nicotine in the air reaches a level, the pattern will disappear and the under pattern uncovered, which is a horrific skull. This implies that the cigarette is dangerous to the live beings.
In this way, smokers will get the information that cigarettes do harm human health visually.
Gu shaoting, Cheng Qiying, Yu Rong