which cigarettes have hole in filter Why do these a perforation on the filter? : r/whatisthisthing Why does Dunhill have that

Why does Dunhill have that hole in the filter? : r Cigarettes Why does the filter have small holes around it like in the picture? : r Cigarettes Hello, apologies for the very dull query can anyone tell me if I can buy cigarettes with filter holes (like the pic) anywhere in Cyprus? And if so, which brand please? Many Bought my pack of smokes today, and the filters now have a half hole in them. Never seen cigs like this. : r mildlyinteresting what does the filter do on a cigarette Cigarette filters: a benchmarking investigation of thermal and chemical attributes Cellulose

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