There are no adverse reactions to quitting smoking. Only in the early stage of quitting smoking does the human body feel uncomfortable because it is the first time to quit smoking, but this is not an adverse reaction, and people can generally improve after overcoming it by themselves. Quitting smoking has absolute benefits to the human body and there are no adverse reactions, so it is recommended not to be too nervous. At the same time, in the early stage of quitting smoking because of the psychological difficulties of acceptance, it is likely that a series of moods such as tension and anxiety, can be relieved by diverting attention, for example, you can get high on some melon seeds, chew some gum, etc., for the excitement of wanting to smoke can play a suppressive effect. You should also pay attention to drink more water and eat more fruits and vegetables to give your brain the illusion that it is working subconsciously, so that you can reduce the habit of smoking and thus achieve success in quitting smoking.