The prefix "3" of China cigarette is just a laser code of each China cigarette package. It can only be seen clearly under fluorescent lamps or ultraviolet rays, so the prefix 3 of Chinese cigarettes was once regarded as a means to distinguish between true and false Chinese cigarettes. In fact, prefix 3, prefix 2 and prefix 1 of China cigarettes only represent the assembly line code in cigarette production. For example, the last three digits of the fluorescent code start with 3, which means Chinese cigarettes with prefix 3, and vice versa, it is prefix 1 or prefix 2.
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Precautions:
1. Don't smoke in bed or on the sofa.
2. Don't throw cigarette butts and match stalks casually, regardless of the occasion.
Don't smoke when repairing cars and cleaning parts.
4. Don't let the ash fall on the combustible when smoking.
5, don't look at the occasion and place to play with ash.
6. Don't rush to put unlit cigarette butts in your clothes pocket.
7. Don't put lit cigarettes on flammable materials.
8. Don't smoke in places where fire is strictly prohibited.
Baidu encyclopedia-China cigarettes