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5 November, 15:44

What is the substance in tobacco products that causes stained teeth and skin?

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  1. 5 November, 16:02
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    The teeth and the skin tend to be stained by the action of nicotine and tar. Nicotine is a substance that is extracted from the leaves of tobacco and that can also be produced synthetically; It is a toxic drug that in small doses produces euphoria, decreased appetite, etc., and in high doses can cause serious poisoning.
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