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Effects on Teeth and Skin

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What substance in tobacco products causes stained teeth and skin?1) nicotine 2)carbon monoxide 3)tar 4)menthol I think #1 Thanks
1. 10 answers
2. asked by Jamie
3. 3,400 views
What is a substance in tobacco products Eco stand teeth and skin
1. 1 answer
2. asked anonymously
3. 39 views