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Read This If You Are a Smoker Who Struggles With Chronic Pain
https://health.clevelandclinic.org/2014/12/read-this-if-you-are-a-smoker-who-struggles-with-chronic-pain/

About 18 percent of people in the U.S. are smokers, according to the Centers for Disease Control and Prevention. Yet smokers make up more than 50 percent of patients who seek pain treatment.