The statement that is not true is: "People who quit smoking cannot reverse any of the damage that has been done to their lungs over an extended period of time."
While it's true that some damage from smoking can be lasting, research has shown that quitting smoking can lead to significant health improvements and recovery over time. The lungs can heal, and the risk of lung cancer and other smoking-related diseases can decrease after cessation, though it may not fully return to a non-smoker's level.