what in cigarettes causes lung cancer The harmful chemicals smoking directly damage cells, causing DNA mutations that increase risk. Over time, these damaged cells grow abnormally, leading to tumor formation in the lungs. Quitting smoking 9 of the Worst Diseases

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Unfortunately, this could lead to nicotine poisoning

DEMBY: And that's why so many public health advocates have been pushing for the federal government to finally ban menthols the way it did with other flavored cigarettes

It is common to see yellow fingers from smoking, as fingers that hold burning cigarettes tend to get stained

MORE: Researchers, doctors in Denver on front line of vaping illness lung research Colorado lawmakers have tried to curb the use of vaping products among young people since the outbreak began, with Boulder banning the sale of flavored vaping products and Denver raising the minimum age to buy tobacco products, including e-cigarettes, to 21