Smoking and cancer.. Cause of lung cancers of the bladder, kidney, mouth, esophagus, stomach and pancreas NIL NAM December 15, 2015 Scientifically established that (80%) of lung cancers caused by smoking, and smoking is responsible for the increased incidence of bladder and kidney cancer doubled, also increases the cancer of the mouth, esophagus, stomach and pancreas. Share This: Facebook Twitter Google+ Stumble Digg