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According to a NASA study, plants are effective in absorbing and converting other toxins from the air in a sealed environment into less harmful substances

1 2 "Annual Report 2018" (PDF)

(Regular cigarettes might feature one ring of ventilation holes, while light and ultra-light cigarettes of the same brand might have two or more rings.) These tiny holes, which you can see by holding the unrolled paper up to a bright light, can allow enough fresh air into the smoke that such cigarettes can test quite low in tar and nicotine levels when smoked by machines, which do not cover the holes

A distinctive Chunghwa edition popular among collectors