Recent research shows that the relationship between smoking and lung cancer may be caused by:
A) the paper in which cigarettes are wrapped
B) smokers not getting enough exercise
C) a chemical in cigarette smoke that turns off a gene that normally suppresses tumors
D) excessive drinking that occurs while the smoker smokes cigarettes

Question

Quizplus · Accepted Answer

Recent research has shown that a chemical in cigarette smoke called nicotine-derived nitrosamine ketone (NNK) can turn off a gene that normally suppresses tumors, leading to the development of lung cancer. The other choices are not supported by current research.

Recent Research Shows That the Relationship Between Smoking and Lung