A new study suggests that Chantix, an anti-smoking drug, can increase the likelihood of a smoker quitting.

“The main contribution of this study is that it demonstrates that for patients who are not ready to quit right away, the use of Chantix could be helpful in getting them to cut down, and then, eventually, to making a quit attempt,” said Dr. Michael Siegel, a professor of community health sciences at Boston University School of Public Health.

Still, “its success comes with a cost,” said Siegel, who wasn’t involved in the study. The medication has been linked to serious side effects, he noted.

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