Because quitting smoking is very stressful and leads to weight gain, it is difficult to do. ███ ███ ██ █████████ ████████ ███ ██ ██ ██████ ██ █████████ ██ █████████ ████████ ████ █ ███████ ████ ██ ███ ██████ ████ ██ █████ ██████████ ██ ████ ████ ████████ ██ █ █████████████████ ███████ ██████ ███ ███ █████ ████ ████ ████████ ██ ███ ████ ███████ ████ ███████ █████ ██ ███████ █████████ ██ ███ █████████ █████ ████ ██ ███ █████ █████ ███ █████ ███ ██ ███████ ██ █████ ██ ███ ██████ █████ ███ ███ ███████
The author concludes that replacing smoking with a healthy habit helps people quit smoking. The evidence is from a study of smokers: all of them participated in a smoking-cessation program, but the group who also did an exercise program found it much easier to quit smoking than the group who didn’t do the exercise program.
The author assumes that the study is reliable—that is, that the study's findings reflect what is true of the general population. The author also assumes that when a smoker stops smoking for one month, that's an indicator of quitting smoking.
Each of the following, if █████ ████████ ████ ███████ ███ ███ ████████ ███████
Regular exercise prevents ██████ █████
Each group in ███ █████ ████████ ████ ███████ ████████ ████████ █████████████
Nonsmokers accustomed to ███████ ████████ ██ ███ ████ ██████ ████ ████ ████ ███████████
Aerobic exercise can █████████ ███ ███████ ██████████ ██ ███████████ █████ ██████ ████████
Of those in ███ ██████ █████ ██ ███ ██████ ██ ███████ ███ ███ ██████ ██ ███ ████████ █████