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Just kidding, we dont like to do the math

Your lips have darkened, and you suspect smoking is the cause

Nicotine can limit the flow of blood to your gum line, leading to tissue death, and even cause inflammation in your mouth that might make the spots worse

[4] [8] [9] The venom of the geography cone snail is a complex mix of hundreds of different toxins that is delivered through a toxoglossan radula, a harpoon-like tooth propelled from an extendable proboscis

These symptoms can have many causes besides cancer, but if they are persistent, unexplained, or worsening, they should be evaluated by a healthcare professional

See my blog post Smoking and Health Care Costs: How Soon After Quitting Do Companies See Savings for details on savings your organization gains when helping people quit