The appearance of hiccups after smoking may be related to the stimulation of the diaphragm by harmful substances in cigarettes, or smoking induces basic diseases of the digestive system. 1. There are many harmful substances in cigarettes, such as nicotine and tar, etc., which may stimulate the diaphragm and make the diaphragm spasm, i.e. hiccups when smoking. 2. If smokers themselves have some basic digestive system diseases, such as reflux esophagitis, gastritis and gastric ulcer, etc., smoking may damage the gastric mucosa induced by these diseases, making the condition aggravated, the gastrointestinal tract functions abnormally, so that the normal contraction of the diaphragm affected by the hiccups. If the recurrence of smoking hiccups, we recommend that you go to the hospital in a timely manner, and actively find the cause and treatment.