Smoking cigarettes to lose weight.
A study highlighted this year says that's one of the reasons becoming significantly more common for U.S. teenagers to light up.
Cornell University's professor of policy analysis and management, John Cawley, conducted the research.
According to his analysis, 46-percent of girls and 30-percent of boys said they smoked in part to control their weight.
The research analyzed data from the health behavior in school-aged children survey for 10,500 students who were 11, 13 or 15-years-old.
Doctors with the National Jewish Health center say many teens turn to smoking to suppress their appetites, but they don't think about the lasting, negative impacts of the habit.
"They're not thinking about the long-term consequences the various cancers, heart disease, chronic bronchitis, all the diseases that could potentially shorten someone's life," said Dr. Christine Cho, a pediatric allergist at National Jewish Health.
Cho stresses - eating a healthy diet and exercising is always the best way to lose weight and notes it also has health benefits. She says it's much easier to do that than to quit smoking later in life because of the addictiveness of nicotine.
Cawley's study, "The Demand for Cigarettes as Derived from the Demand for Weight Loss: A Theoretical and Empirical Investigation," is featured in the January 2016 issue of Health Economics.