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After finding potential carcinogens in some lots of Chantix, Pfizer (PFE) late last month halted worldwide distribution of its smoking cessation pill.

The drug maker, which is now running tests, took this step after finding nitrosamine levels that were above an “acceptable” daily intake, according to the company. Consequently, regulators in Canada and South Korea, for instance, have posted recall notices for the medicine, which is called Champix outside the U.S. Pfizer also sent letters to distributors about its actions.

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