Patients who have been smoking for a long time may develop withdrawal syndrome at once, which manifests itself as insomnia, anxiety, and agitation. Smoking is harmful to health, tobacco contains a large number of harmful substances, such as nicotine, tar, etc., long-term smoking is easy to cause respiratory system, cardiovascular system and other diseases, the sooner you quit smoking, the greater the benefits to the body, for a short period of time, not addicted to smoking, the patient quit smoking at once is not much effect. Addicted patients who quit smoking all of a sudden may experience withdrawal syndrome, withdrawal syndrome refers to the long-term use of a substance addiction, due to the sudden reduction and cessation of a mental, nerve-related symptoms, such as insomnia, anxiety, agitation, etc., with the passage of time, these symptoms will gradually weaken and disappear, so no matter how serious the addiction is, you should be active in quitting smoking.