The PDQ cancer information summaries are reviewed regularly and updated as new information becomes available. This section describes the latest changes made to this summary as of the date above.

Evidence of Benefit ¹

Added text ² to state that as more is learned about specific genetic variants that influence a smoker's response to smoking cessation pharmacotherapies—such as polymorphisms in genes encoding enzymes involved in nicotine metabolism—this information could eventually be integrated into smoking cessation treatment planning (cited Ray et al. as reference 26).