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The intensity of the darkening is influenced by the amount smoked, duration of smoking, and individual skin responses.The good news is that lip pigmentation from smoking is not always permanent

Maraddi, G

You could say its part of the point, but that might be projecting good intentions on a film that seems to care little for whats paving the highway to hell

Among former smokers, those who smoked menthol cigarettes showed: 12% higher risk of death from all causes 16% higher risk from cardiovascular diseases 13% higher risk from coronary artery disease 43% higher risk from other heart diseases Mortality risks were shown to be especially high for individuals who quit smoking or smoked 40 or more menthol cigarettes per day

Martnez V, Iriondo De-Hond A, Borrelli F, Capasso R, del Castillo MD, Abalo R