Because smoking is a form. of addiction, 80% percent of smokers who quit usually experienc

e some withdrawal symptoms (断症状瘾). These may include headache, light-headedness, and chest pains. Psychological symptoms, such as anxiety, short-term depression, and inability to concentrate, may also appear. The main psychological symptom is increased irritability. People become so irritable, in fact, that they say the feel "like killing some body". Yet there in no evidence that quitting smoking leads to physical violence.

Some people seem to lose all their energy and drive, wanting only to sleep. Others react in exactly the opposite way. Becoming so over energized that they can't find enough activity to burn off their excess energy. For instance, one woman said she cleaned out all her closets completely and was ready to go next to start on her neighbor's. Both these extremes, however, eventually, the symptoms may be intense for two or three days, but within 10 to 14 days after quitting, most subside (平静下来). The truth is that after people quit smoking, they have more energy, they generally will need less sleep, and feel better about themselves.

Quitting smoking not only extends the ex-smoker's life. but adds new happiness and meaning to one's current life. Most smokers state that immediately after they quit smoking, they start noticing dramatic differences in their overall health and vitality.

Quitting is beneficial at any age, no matter how long a person has been smoking. The death rate of an ex-smoker decreases after quitting. If the patient quits before a serious disease has developed, his/her body may eventually be able to restore itself almost completely.

Which of the following is the main psychological symptom of smokers who quit？ ______.

A．Being light-headed

B．Being anxious

C．Being easily annoyed

D．Being violet