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Certain chemicals in smoke break down in hair cells, which leads to hair damage

Eugene Umberger [183] These works were all published in an era before the cigarette had become the dominant form of tobacco consumption and pipes, cigars, and chewing tobacco were still commonplace

Moreover, CS altered microbial niches at multiple oral sites, enriching Treponema and Selenomonas in saliva and Dialister and Atopobium on the tongue

Smoking only about one cigarette per day carries a risk of developing coronary heart disease and stroke much greater than expected: around half that for people who smoke 20 per day, the researchers wrote in the conclusion

Current Opinion in Oncology

In other words, the delivery system has changed, but the substance driving the addiction remains the same