While squamous cell carcinoma is related to alcohol and any kind of tobacco use, adenocarcinoma is more related to gastroesophageal reflux disease.
http://ezinearticles.com/?Esophageal-Cancer-Symptoms—The-Deadly-Signs-of-Acid-Reflux-Cancer&id=4356756
Esophageal Cancer Symptoms – The Deadly Signs of Acid Reflux Cancer