News Pfizer recalls Chantix smoking cessation drug for increased cancer risk due to high levels of nitrosamine September 17, 2021September 18, 2021 Kelly Tyko, USA TODAY Comments Off on Pfizer recalls Chantix smoking cessation drug for increased cancer risk due to high levels of nitrosamine Pfizer is voluntarily recalling lots of its popular anti-smoking drug Chantix for high levels of nitrosamine, which can increase the risk of cancer.