Why aren't cigarettes clearly marked with an expiration date?
Generally, the products can be sold within half a year, and when the products leave the factory, the production date has been marked on each box. The technicians of cigarette manufacturers generally believe that cigarettes are a very complicated product, and their shelf life varies greatly depending on the storage environment. The dry environment can be stored for two or three years, and if the environment is not good, it will last even a year. Unable to store. Differences caused by these factors are generally not marked. The relevant person in charge of the State Tobacco Monopoly Administration once explained to the media that the harm of cigarettes to the body is not determined by time. The expiration date doesn't make any sense. Does the burning speed of a cigarette have anything to do with the quality of the smoke? Not necessarily, the speed of tobacco burning (automatic combustion after ignition) is related to many factors. The first point is additives. There are more or less combustion accelerants in cigarettes. Anyone who grows their own tobacco leaves knows that it is better to add alcohol to it. This is not to say that the more advanced the smoke, the more advanced the combustion accelerant, and the water in it is still very deep, it is already very complicated. The second point is the type of tobacco. Burley and other tobacco leaves in flue-cured tobacco have different ignition points. Not to mention flue-cured tobacco and mixed tobacco, the burning speed is of course different. The third point is cigarette paper. For example, the hemp paper and glutinous rice paper in hand-rolled cigarettes have completely different burning speeds. For cigarettes, the cigarette paper is not much different. Lastly is the location. The same smoke will definitely burn differently in Harbin than in Zigong Lasana, and the air pressure and oxygen content must be considered.
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