what is the black stuff in cigarette filters

what is the black stuff in cigarette filters use of charcoal modified for mainstream smoke carbonyl reduction Who Made That Cigarette Filter?

Name: what is the black stuff in cigarette filters use of charcoal modified for mainstream smoke carbonyl reduction Who Made That Cigarette Filter?
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Who Made That Cigarette Filter? The New York Times Black & Mild Filter Tips Free Shipping Over $99 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 Why do these cigarettes have a perforation on the filter? : r whatisthisthing

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The nicotine in e-cigarettes is harmful for developing babies, and can lead to addiction and harm brain development in children and young adults into their early 20s