why do some cigarettes have holes in the filter

why do some cigarettes have holes in the filter these a perforation on filter? : r/whatisthisthing Who Made That Cigarette Filter?

Name: why do some cigarettes have holes in the filter these a perforation on filter? : r/whatisthisthing Who Made That Cigarette Filter?
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The fact is there is no gateway effect between the two since the National Institute of Healths Monitoring the Future (MTF) survey actually found decreases in teen smoking and e-cig use over the last two years, and just a few days ago, the CDC reported that smoking among teens has hit dramatic lows over the past two years." New data from the U.S