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According to a Philip Morris Inter-office memo from 1987, those cigarettes which have tar delivery levels of less than 14 mg are considered "Light" and those with levels under 6 mg are considered "Ultra Light (1)

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Editorial note: We first published this guide on November 21, 2024, and our team last reviewed and updated it on July 14, 2026

They induce the production of free radicals, which cause lipid peroxidation (or degradation) and can lead to an inhibition of hair follicle growth, but also to a degradation of hair pigments, thus causing discoloration or alteration of the original hue