tobacco melanosis Pigmented lesions of the oral cavity: An Update Smoker's melanosis - Wikipedia
Description
[57] Tobacco smoke contains anabasine, anatabine, and nornicotine

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Heischmann S, Quinn K, Cruickshank-Quinn C, Liang L-P, Reisdorph R, Reisdorph N, Patel M

at the same time, some of the upper leaves are also removed
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