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Key factors contributing to yellowing of smokers' teeth Tar and nicotine: despite being colorless when inhaled, these chemicals oxidize when exposed to oxygen, taking on a yellowish or brownish tint

Cocaine use can cause the blood vessels to constrict, causing lymphatic fluid to build up in the narrowed vessels, which can contribute to bloating or swelling

[DOI] [PMC free article] [PubMed] [Google Scholar] Messina ES, Tyndale RF, Sellers EM

In the UK, free local stop-smoking services are available throughout the country, offering evidence-based treatments like medications, nicotine replacement therapy, and personalised quit plans