why are some cigarette filters white

why are some cigarette filters white TIL that change color not because they trapping part of the cigarette smoke, but because they are designed to change color to lead consumers to think that they are Who Made That Cigarette Filter?

Name: why are some cigarette filters white TIL that change color not because they trapping part of the cigarette smoke, but because they are designed to change color to lead consumers to think that they are Who Made That Cigarette Filter?
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doi: 10.1183/09031936.00145307 57 SaraivaMVieiraPO'GarraA

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Pictorial HWLs can reach large numbers of smokers and non-smokers and have the potential to decrease communication inequality across various sociodemographic subgroups [46,47,48]