About percent of those who try in any one year to quit smoking cigarettes on their own actually succeed
a. seven
b. twenty-one
c. forty-nine

7% succeed from people who tried to quit smoking. The percentage is low but it can be an evidence that a person can really change. This is because of the difficulty for the person to stop it. If a person stops smoking, their body gets weak and tired that makes them think that they want to smoke again. This is a common situation to smokers in their first months of depriving themselves from smoking.