Which of These Behaviors Is Most Likely Changeable

Multiple Choice

Which of these behaviors is most likely changeable?

A) Smoking cessation among a group of people who have smoked for 20 or more years
B) Smoking cessation at a work place where smoking is common and deeply imbedded
C) Smoking cessation in a school for students who have only recently started smoking
D) Smoking cessation in a public environment where cigarettes are openly sold and persons are allowed to smoke