black spots in cigarette filter Why do these cigarettes have a perforation on the filter? : r/whatisthisthing Today a black surprise for

Today a black surprise for Jen I cleaned my filter This is the e first time I have such black spot on the filter Do you have any idea ? Brother sent me this photo, What type of mushies would be growing on the filters of cigs? : r mycology pall mall shift filters have these black marks on them, several of them have it not just one. is this normal? never seen this before : r Cigarettes TIL that cigarette filters change color not because they are trapping part of the cigarette smoke, but because they are designed to change color to lead consumers to think that they are Wtf is this black stuff in my filter : r Cigarettes View of filter stains from cigarettes that had been smoked with filter Download Scientific Diagram

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