More than 36 million U.S. adults smoke cigarettes, and a majority of those adults are of a low socioeconomic status.
A new study from the Colorado School of Public Health found nearly three-fourths of smokers have "one or more low-socioeconomic disadvantages."
The study found that about one in four adults without a high-school diploma is a smoker. And about 28 percent of people who smoke live in poverty.
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Additionally, around 40 percent of Medicaid recipients and adults with disabilities are smokers.
Researchers say this can raise ethical concerns when it comes to U.S. tobacco control.
A separate study from the Centers for Disease Control and Prevention found there's a higher density of tobacco retailers in low-income neighborhoods.
